Did anyone ever discover how the escape
artist Harry Houdini did it?
Isn't it curious that something you keep putting in your
mouth and moistening with saliva is a standard of
cleanliness? Whoever coined this expression must have
thought that some people spit detergent. Maybe they had
their mouths washed out with soap for using bad words
when they were kids.
But this is not about modern-day whistles. The
explanation lies in the distant past, when whistles, like
musical instruments, were handmade, usually carved from
wood. In order to get a pure tone, the carver would have
to be careful to avoid faults inside the whistle, making
the bore absolutely flawless. In other words, it had to
be clean. Thus if something is really clean, it's, well .
. . that clean.
(Source: DICTIONARY OF WORD & PHRASE ORIGINS by W.
& M. Morris)
FAST FACTS:
What is a toadstool? It's what a frog sits on when it
goes to a bar. Okay, not really. A toadstool is the spore-producing
body of a fungus. Although, I still think my first answer
was more clever.
Contrary to belief, only a few toadstools are poisonous.
But after you find out a toadstool is a spore-producing
fungus, who would want to eat one anyway?
(Source: 1001 QUESTIONS & ANSWERS WORLD OF
KNOWLEDGE)
Why is extreme deference to someone in
authority "kowtowing?"
If your etymological instincts suggest that kowtow might
have been a Chinese word for towing away an illegally
parked cow,
don't trust them. You're looking at an Anglicization--about
as Chinese as Chop Suey. The word did originate in
Chinese, but as kotow.
The custom behind this word startled Europeans who began
to
visit China at the end of the Middle Ages. The visitors
were used to bowing to people of noble rank, but the
Chinese went
them one better, kneeling on the ground with their
foreheads actually touching the ground.
The Europeans wisely observed this local custom and
brought
back the word, or at least a bastardized form of it, to
describe pronounced deference. Today we have earthier
expressions in English describing such obsequiousness to
a teacher or boss, but propriety stays my fingers from
typing them.
(Source: WHY YOU SAY IT by Webb Garrison)
FAST FACTS:
It would take a spacecraft traveling at the speed of
light more than four years to reach the closest star. So
if you make the trip you might want to pack a lunch
because you'll need more than a bag of honey roasted
peanuts.
The Cuckoo Bird doesn't build its own nest. It finds
another bird's nest, waits for the parents to leave,
swoops in leaves its own egg for the original owner to
hatch. Let me get this straight, the cuckoo gets another
bird to build its nest, sit on its egg, and raise its
young...and this is the one they call a cuckoo?
(Source: 1001 QUESTIONS & ANSWERS WORLD OF
KNOWLEDGE)
What's the coldest biome (land-based ecosystem)?
Of all the kinds of ecosystems on land the coldest one is
the tundra, found in the Arctic and at high elevations in
the mountains. In these treeless regions, plants and
animals are forced to survive on almost no available
resources.
Because the climate is so harsh there is little extra
energy for plants to put into large size or fancy flowers.
They are generally small and grow only during a short
part of the year. They have shallow roots because the
soil is very shallow, resting on a layer of always-frozen
ground called the permafrost.
Animals in the tundra are equally challenged. Many
hibernate for almost the entire year, and some migrate
when winter comes. Animal populations are subject to
extreme population cycles, and the total mass of animal
life is low compared to warmer biomes.
More about the tundra:
http://www.runet.edu/~swoodwar/CLASSES/GEOG235/biomes/tundra/tundra.html
http://www.uwsp.edu/acaddept/geog/faculty/ritter/geog101/modules/biosphere/biomes_tundra.html
The tundra provides interesting research
opportunities:
http://www.colorado.edu/INSTAAR/TEAML/ITEX/
The oldest viable seeds were found buried in the
tundra:
http://features.LearningKingdom.com/fact/archive/2000/03/29.html
What's the difference between a cyclone, a
hurricane, and a tornado?
Any of these windbags can blow you away. In each the wind
spins around a low-pressure core. They differ in the
speed of the spin, the size of the storm, it's duration,
and how fast it travels.
A tornado has the tightest focus--generally less than a
mile across. Although usually over in a few minutes, its
wind can rotate at up to an incredible 300 mph and speed
ahead at 40 mph. Hurricane winds typically may swirl at
100 mph, but that's over a diameter of maybe 600 miles.
With a forward speed of 10-20 mph, they can last for at
least a week. A cyclone moves ahead at about 25 mph. It's
wind doesn't swirl at more than 60 mph - but that's over
an area of as much as 1000 miles, and it can last a
couple of weeks. If this one is forecast, build an ark.
(Source: THE HANDY SCIENCE ANSWER BOOK)
What keeps the ice on a skating rink frozen?
The answer is a very efficient system because the ice, as
you may have noticed, stays frozen even when the sun
shines and the temperature borders on the balmy. The
method they use to achieve this often has something in
common with the process of producing pickles: brine.
When you lace up and balance yourself on a blade, you are
literally skating on thin ice--about two inches worth.
That sits on top of a concrete base. Within the concrete
are thin pipes, about an inch thick, through which flows
brine at temperatures as low as -15 degrees F. or a
similarly cold glycol solution (yes, that's antifreeze!).
The cold concrete keeps the ice frozen. It's that simple.
Isn't that cool?
(Source: HOW DO THEY DO THAT? by Caroline Sutton)
FAST FACTS:
Ancient Egyptians slept on pillows made of stone. That's
actually what caused many of their deaths...pillow fights.
97% of the world's water is in the ocean. The other 3% is
in my basement after every rainstorm.
(Source: 2201 FASCINATING FACTS)
How do parasites control their host's behavior?
Throughout the animal kingdom there are examples of
parasites that take over the behavior of their hosts in
order to improve their own chances of survival. These
"body snatcher" parasites cause their hosts to
act in ways that are very different from their normal
behavior.
When a thorny-headed worm reaches maturity inside a
pillbug, it causes the pillbug to move out into the light,
against its normal
urge. Exposed, the pillbug is more likely to be eaten by
a bird. If it is eaten, the thorny-headed worm then
enters the next stage of its life cycle inside the bird,
its new host.
There are dozens of examples of this kind of control. In
most cases, the parasite controls its host's behavior by
adjusting levels of hormones in the host's body. In at
least one case, the parasite actually manipulates the
host's DNA directly, turning certain genes on or off.
More weird parasitic manipulations:
http://www.canadiangeographic.ca/MA99/curious.htm
Another kind of manipulative parasite:
http://www.cool-fact.com/archive/1999/06/24.html
Was there really a King Arthur--and how about
that round table?
There's so much debunking and myth-mashing these days
that I'm pleased to tell you that this story may at least
have had some roots in the exploits of a real person,
although nothing like the one in the legend.
Ancient documents refer to an Arthur in the middle of the
first millennium who fought to keep the Anglo-Saxons from
conquering Britain. He appears to have been not a king
but rather a brave mercenary and fierce warrior. He is
certainly far from the romantic ruler who began in Celtic
legend and was then embellished through epic poems and
ballads as the centuries passed.
The round table, by the way, an early part of the myth,
was a clever way of letting the knights feel that each
was equally important: none sat near the head of the
table.
(Source: FABULOUS FALLACIES by Tad Tuleja)
FAST FACTS:
Contrary to what many people believe, Roman emperors did
not necessarily signal that a losing gladiator in the
arena was to die by giving the thumbs down signal. "Pollice
verso," the Latin phrase from which the thumbs down
idea came, actually just means "thumb turned."
Some scholars even think that thumbs down meant that the
victor should put down his sword and spare the vanquished.
Regardless, no losing gladiator could expect good things
if the emperor extended his middle finger.
(Source: FABULOUS FALLACIES)
What insect has been completely domesticated?
The silkworm moth (Bombyx mori) has been bred in
captivity for thousands of years and probably no longer
occurs in nature. During this time, like other domestic
animals, it has evolved.
Today's silkworm moths are almost unable to fly, and
cannot exist without human care. Each moth lives only a
few days as an adult, and does not eat. After mating,
females lay 300-500 eggs.
The caterpillars eat mulberry or osage orange leaves
until they are ready to pupate. Then they enclose
themselves in a cocoon made out of a single strand of
silk about one kilometer long. Most silkworm pupae are
destined to die, sacrificed so that their silk can be
harvested.
The history of sericulture (silk production from
silkworms):
http://www.bugbios.com/ced1/seric.html
More Cool Facts about insects:
http://features.LearningKingdom.com/fact/archive/1998/04/07.html
http://features.LearningKingdom.com/fact/archive/1998/10/13.html
http://features.LearningKingdom.com/fact/archive/1999/01/13.html
Why do we call someone who'll write almost
anything for money a "hack?"
Well it's not because they sometimes feel like taking an
axe to their clients. The origin of the word lies not in
a sharp temper--or wit--but rather in the animal kingdom.
Hack is short for "hackney," a word that since
the 13th century has meant an ordinary horse, an animal
that was not a thoroughbred or war horse used by a knight
but rather just an everyday nag useful for mundane tasks.
In other words, a horse that did the drudge work. After a
century or so the word also came into use for a horse
that could be hired out. By the 16th century it was being
applied to people who did work for hire, including
prostitutes. Two hundred years later hackney became hack.
(Source: THE OXFORD ENGLISH DICTIONARY)
FAST FACTS:
During the Cold War the Brits and Americans built what is
thought to be the longest tunnel ever constructed for the
purposes of spying. They began in West Berlin and dug 1,476
feet into East Berlin, intending to tap into underground
cables used by the Communists to send messages.
What the intelligence agencies of both countries have
suppressed to this day is an embarrassing fact: when a
small test hole was dug to the surface, what they saw was
not the Berlin Wall but the Eiffel Tower.
(Source: THE GUINNESS BOOK OF RECORDS)
Who built the first pendulum clock?
Although the Italian inventor Galileo Galilei studied the
motion of pendulums in 1592, and actually designed a
pendulum clock, he never built one. It was not until 1656
that the Dutch scientist Christiaan Huygens built a
working clock regulated by a freely swinging pendulum.
Huygens' pendulum clock was revolutionary. Its error was
less than one minute per day, and later refinements
brought the accuracy within ten seconds per day.
Improvements continued over the next century, including
compensation for temperature changes and other
environmental error sources. The most accurate pendulum
clocks now keep time to within one hundredth of a second
per day.
Pendulum clocks were the most accurate timekeepers until
the
development of the electronic quartz oscillator in the
1930s.
A history of timekeeping:
http://physics.nist.gov/GenInt/Time/time.html
Christiaan Huygens is a Person of the Day:
http://www.LearningKingdom.com/person/archive/2000/05/19.html
Pendulum is a Cool Word:
http://www.cool-word.com/archive/2000/05/19.html
More Cool Facts about timekeeping:
http://www.cool-fact.com/archive/1998/09/25.html
http://www.cool-fact.com/archive/1998/12/18.html
http://www.cool-fact.com/archive/1999/05/19.html
Does a cat's purr mean that it's
contented?
Whatever it means, it sure makes the person living with
the cat melt when they hear it. They know they're picking
up good vibrations.
So what is kitty trying to communicate with this sexy
sound?
In truth, just about anything. It's an all-purpose noise,
first used by the mother to summon her newborn and still
sightless and hearing-impaired kittens. The vibrations
lead them to mama.
But don't try to tell that to a cat lover. They know it
means that after six years of expensive cat food and
unconditional love, Tabby may finally consent to sit on
their lap.
Pretty please! Purr.
(Source: THE STRAIGHT DOPE by Cecil Adams)
FAST FACTS:
The Vikings have really had a bad press. They did more
than just plunder, rape and pillage. They also dressed
for success. They were even sensitive about putting a
crease in their pants and employed an iron that looked
like an upside down mushroom to make sure they looked
natty. The wealthiest among them wore pleats.
Among Vikings, clothes made the man--along with a
sufficient
number of smashed enemy skulls on the mantelpiece.
(Source: EXTRAORDINARY ORIGINS OF EVERYDAY THINGS)
Where is the driest desert on Earth?
At some places in Chile's Atacama Desert, it does not
rain for centuries at a time. A long, narrow strip of
land along the western coast of South America, the
Atacama is protected from clouds by the Andes Mountains,
the world's second highest mountain range.
Many parts of the Atacama Desert receive average annual
rainfall of less than 0.004 inches (0.1 mm), and some
spots have not seen rain in 400 years. Although the
desert is located right next to the Pacific Ocean, the
prevailing winds come down from the lofty mountains and
sweep out to sea.
But as dry as it is, even the Atacama supports life.
There are tiny pockets where fog from the sea creates
enough moisture for plants and even some animals, and
there are also a few humans living in the Atacama.
Where is the water, and why is it so dry?
http://www.extremescience.com/DriestPlace.htm
A robot crosses the Atacama:
http://img.arc.nasa.gov/Nomad/nomad_oldbrowsers.html
The driest continent is also the coldest:
http://features.LearningKingdom.com/fact/archive/1997/07/06.html
The largest desert in the world:
http://features.LearningKingdom.com/fact/archive/1999/09/30.html
Why is taking a nap "catching 40 winks?"
This business of napping by the numbers always seemed
pretty
curious. Why 40 rather than 9, 11, 17 or 30?
There is a long tradition, starting with the Bible, of
using 40 to stand for significant quantities. For example,
when Noah took his boat ride, it rained 40 days and 40
nights. Moses had spent the same amount of time up on the
mountain. In the Middle Ages an Englishman sure of
something would bet 40 pence on it. And so on.
But the phrase 40 winks has a specific rather than
general origin. It comes from an 1872 issue of Punch, the
British humor magazine. Punch referred to the Thirty-nine
Articles of faith of the Church of England, joking that
actually reading through them would induce 40 winks. Call
it a yawning gap between conscience and consciousness.
Sources: (HEAVENS TO BETSY by Charles Earle Funk)
What kind of spider steals food from other
spiders?
If you look closely at the web of a giant golden orb
spider (Nephila edulis), you might see much smaller
spiders on it. These round, silvery nest parasites are
droplet spiders (Argyrodes antipodianus) waiting for
small prey that their giant host ignores.
Small prey insects are not the droplet spiders' only food.
These
crafty little thieves sometimes band together and
carefully steal large prey that the host spider has
caught and wrapped, but not yet eaten.
One by one, they cut the lines between the catch and the
main web, carefully repairing damage by bridging the gap
with their own webs. Then they carry the prey off to a
corner, where they can safely consume it.
Pictures of Nephila and droplet spiders:
http://www.xs4all.nl/~ednieuw/australian/nephila/Nephila.html
A spider enthusiast's observations of spiders,
including Nephila:
http://home.wxs.nl/~voort359/home22.html
More Cool Facts about spiders:
http://www.cool-fact.com/archive/1998/07/08.html
http://www.cool-fact.com/archive/1998/07/29.html
http://www.cool-fact.com/archive/1999/02/17.html
Is it best to turn off your
computer at night, or let it run all the time?
If your computer turns you off, you probably enjoy
turning IT off for the night. But is it wise to do so?
There are arguments on both sides. Take your pick.
Turning a computer on and off changes the temperature of
its components, which stresses them. The fan keeps the
temperature constant while the machine is running. Except
for the monitor, which you should turn off or put in
power-saving mode when not using it for an hour or more,
computers don't use much electricity when run constantly.
On the other hand (or finger, since computers are digital)
leaving it on can wear down the always-spinning hard
drive, and dust on the fan can make it an inefficient
cooler. If you leave it on you will also need to reboot
periodically to flush the memory of digital garbage
programs leave behind when you close them.
(Source: PC'S FOR DUMMIES by Dan Gookin)
FAST FACTS:
A lightning bolt embodies as much as 30,000 amps of
electricity, reaches a temperature of 54,000 F., give or
take a few degrees, and may be anywhere from 300 yards to
4 miles
long.
(Source: THE HANDY SCIENCE ANSWER BOOK)
How are permanent tattoos applied?
Early methods of tattooing were much more painful than
the modern approach. Some involved applying dye to open
wounds, or pulling soot-covered threads through the skin
with a needle.
A modern permanent tattoo is made of pigment that is
injected between living skin cells in the dermis, the
layer below the constantly-replaced epidermis. Because
the dermis is not being constantly renewed, the dye is
not dispersed and it can remain in place for many years.
A tattoo machine works much like a sewing machine: a
steel needle vibrates up and down many times per second,
penetrating about two millimeters deep (1/8 inch) and
delivering dye particles. Thomas Edison invented the
first such machine in 1876.
How tattoos work:
http://www.howstuffworks.com/tattoo.htm
Tattoo has become a "fine art" in recent
decades:
http://www.tattooartist.com/history.html
What's the origin of the word tattoo?
http://features.LearningKingdom.com/word/archive/1999/03/24.html
How do chameleons change color?
There's a popular misconception that a chameleon's color
will reflect their background, but the true causes are
more than skin deep. After all, if they were only
influenced by what they were standing on, what color
would they change if they were standing on a mirror?
Chameleons are actually reacting to a variety of
environmental
conditions, including light, temperature and emotion. The
quick-change mechanism involves special cells that
contain tiny little granules of pigment. The nervous
system controls the dispersion (or concentration) of that
pigment throughout the cells, leading to a true coat of
many colors.
(Source: ENCYCLOPEDIA BRITANNICA)
FAST FACTS:
The cockroach is an amazingly hearty creature. Take its
head off in such a way that it does not bleed to death
and it will go on haunting your cupboard for weeks on end.
However, its life-force instinct will finally fail to
compensate for the fact that it is now mouth-impaired and
it will eventually starve to death.
(Source: ISAAC ASIMOV'S BOOK OF FACTS)
Who built the world's first motorcycle?
Most sources claim that the first motorcycle was built by
Gottlieb Daimler, an assistant to Nicholaus Otto (who
invented the Otto cycle, a kind of engine). In 1885,
Daimler added a gasoline motor to a wooden bicycle,
replacing the pedals. Daimler's motorbike was propelled
by an engine, but it was not the first motor-driven cycle.
Actually, the first motorbike was built seventeen years
earlier in 1868. It was not powered by a gasoline engine,
but by a steam engine. Its builder was Sylvester Roper.
His steam-powered bike did not catch on, but it
anticipated many modern motorbike features, including the
twisting-handgrip throttle control.
History of the motorcycle:
http://www.motorcycle.com/mo/mcmuseum/firstbike.html
http://www.uh.edu/engines/epi1286.htm
http://www.uh.edu/engines/epi921.htm
Why are tires black?
http://features.LearningKingdom.com/fact/archive/1999/08/13.html
The first skateboards:
http://features.LearningKingdom.com/fact/archive/1999/10/01.html
Do you really have to "lather, rinse,
repeat" with shampoo?
It's amazing how much attention we pay to that often-unruly
clump of dead tissue on top of our head. In fact, we pay
a lot more than attention. Hair is big business,
especially when it comes to shampoo.
You use shampoo at least several times a week. How does
your hair and scalp look and feel after you apply it?
Pretty clean, right? But invariably the instructions on
the bottle advise you that you're not through yet: "Rinse
and repeat."
They want you to go around again. Why? As I said, shampoo
is part of a big business. If you use twice as much, they
sell twice as much. In fact, confidential interviews with
shampoo bigwigs--no names please--have revealed that it's
the only reason they can give to apply it twice.
See, it all comes out in the wash.
(Source: IMPONDERABLES by David Feldman)
Where were maps deliberately published with
errors?
In the old Soviet Union, maps were often made with
deliberat errors. Towns, rivers, and roads were placed
incorrectly, and entire towns would be missing in some
versions. Moscow street maps were especially inaccurate.
The false maps were part of a plan to prevent foreigners
and even the Soviet citizens from knowing the details of
the geography of the Soviet Union. It was thought that
this would increase security, but actually it made the
whole country less efficient.
The false maps were part of a much broader concept called
Maskirovka, a word that has meanings relating to
misdirection, camouflage, misinformation, and diversion.
According to some experts, the Maskirovka philosophy is
still very much a part of Russian strategy, and
influences many parts of the society.
Maskirovska deeply influenced Soviet military
strategy:
http://www.airpower.maxwell.af.mil/airchronicles/apj/apj88/smith.html
The first world map was inaccurate for different
reasons:
http://features.LearningKingdom.com/fact/archive/1999/01/26.html
How can you tell real pearls from
fake ones?
We hold pearls in very high regard, even using the
precious little things as a synonym for something that is
small and very valuable, as in pearls of wisdom. So it's
important to be able to tell the real thing from the
wannabes. After all, there's no point in your casting
your costume jewelry before swine, is there?
The real pearl is a mollusk's concretion, the most
essential ingredient of which is aragonite. Not clear
enough criteria for you? Ok, check the price - real ones
cost more.
All right, enough fooling around. Put the "pearl"
in your mouth and slosh it softly across your teeth. (Be
careful not to swallow it!) Does it feel totally smooth?
If it does, it's fake. The real thing feels slightly
gritty. You can trust this test because it's used all the
time by people whose livelihoods depend on it:
professional jewel thieves.
(Source: HOW DO THEY DO THAT? by Caroline Sutton)
FAST FACTS:
It's believed that pirates thought that piercing their
ears and wearing earrings improved their eyesight.
Then again, they also thought walking the plank was a
good form of exercise.
(Source: 2201 FASCINATING FACTS)
Where's the best place on Earth to find
meteorites?
Meteors fall into Earth's atmosphere over every spot on
the planet.
However, there is one place that's far better than
anywhere else to find the meteorites that make it all the
way to the ground. That place is a windswept field of ice
near the edge of the East Antarctic Ice Sheet.
There, near the Allan Hills (which are actually the tips
of huge mountains buried in the ice) one can find
hundreds of meteorites lying around on the surface of the
ice. There are tons of them.
How did they get there?
Meteorites fall into the snow all across Antarctica, then
sink down until they hit a layer of solid ice. That ice
flows slowly across the continent, to certain places
where ice-buried mountains push it up. The upthrust ice
evaporates in the dry Antarctic wind, leaving the
meteorites exposed.
More about Antarctic Meteorites and the people who
hunt for them:
http://wwwdsa.uqac.uquebec.ca/~mhiggins/MIAC/antarc.htm
http://www-curator.jsc.nasa.gov/curator/antmet/antmet.htm
http://www.cwru.edu/affil/ansmet/
NASA has a robot that searches for Antarctic meteorites:
http://www.frc.ri.cmu.edu/projects/meteorobot/
Why do we say that someone on a
rampage has "run amuck?"
I love this expression. It sounds like somebody is
dashing through a field of mud, oblivious to the mess
they're making --a lot more fun than jogging. Anyway, not
to dwell on my childish fantasies, it turns out that
"muck" has nothing to do with muck and mire and
any manner of messy things. In fact, it doesn't even come
from English or a closely related language.
The word amuck, sometimes spelled amok, is from a 17th
century Malay word, amoq, which means to fight furiously,
almost in a bloodlust. Today, even if the person running
amuck is not leaving a bloody wake, the implication is
still that he or she is out of control, in a frenzy,
leaving total chaos behind. In a word: nuts.
You know, that still sounds attractive. Excuse me while I
run amuck.
(Sources: THE OXFORD DICTIONARY OF ENGLISH ETYMOLOGY)
FAST FACTS:
Nothing can be burned that has already been burned once.
Whoever decided that obviously didn't play the stock
market much.
(Source: 2201 FASCINATING FACTS)
Do porcupines really shoot their
quills at their enemies?
There are two denizens of the woods that are peculiar in
their means of defending themselves. One is the skunk,
who will put up a big stink when cornered. The other is
the porcupine, which looks like a walking pincushion.
Most of us have come across the skunk's calling card in
the country, but I'll bet you've never encountered a
porcupine except in a zoo. So I'll just have to tell you:
this little charmer does not launch itty-bitty guided
missiles at its foes. In fact, the animal's first line of
protection against an attacker is to run like the dickens
in the opposite direction. But if cornered, the porcupine
will turn its rear end to its enemy--mooned by a
porcupine!--and whack it with its quill-covered tale. The
other party usually gets the point.
(Sources: MYTH-INFORMED by Paul Dickson & Joseph
C. Goulden)
FAST FACTS:
According to a professor at the University of Michigan,
men are six times more likely than women to be hit by
lightening.
Could that be because more women have the sense to come
in
out of the rain?
(Source: 2201 FASCINATING FACTS)
What color is pure water?
You might think that absolutely pure water would be
perfectly clear and utterly transparent, but it's
actually blue. The blue color of the water in the oceans
(and not the blue of the sky) is the reason why Earth is
mostly blue as seen from space.
Pure water absorbs some of the light that passes through
it. It absorbs red light more than yellow, yellow more
than green, and green more than blue. Only the deepest
blue light can travel very far through water, so a large
mass of water takes on a deep blue color.
The blueness of water is easily visible in a swimming
pool lined with white concrete. It's even visible in a
white porcelain bathtub. But the bluest water of all is
the clear tropical ocean far from land, where the sea is
much bluer than the sky.
The color of the ocean is strongly affected by
plankton and impurities:
http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/OCDST/what_is_ocean_color.html
http://www.oceansonline.com/rainbows.htm
More Cool Facts about water:
http://www.cool-fact.com/archive/1997/07/11.html
http://www.cool-fact.com/archive/1998/06/08.html
http://www.cool-fact.com/archive/1999/01/19.html
How do modern freezers remain frost-free?
If you own an old refrigerator you may need to defrost
the freezer from time to time, a difficult task possibly
requiring a lot of scraping and hot water. How do modern
freezers stay free of accumulated ice?
Ice condenses in the freezer because cold air can't hold
as much water vapor as warm air. In an older freezer
frost forms on everything every time warm, moist air
enters from outside. In a more modern freezer the air is
circulated by a fan and the frost forms mostly on the
coldest surface, which is the cooling coils in the back.
You might think that the coils would quickly be
surrounded by solid ice, and they would, if not for the
defrost function. Every so often a heating element warms
up the air around the coils just long enough to melt the
frost. The water trickles down the back of the freezer to
a tray near the floor where it evaporates.
More about the auto-defrost function:
http://www.phoenix.net/~draplinc/defrost.html
Auto-defrost uses energy. Here are ways to save
energy:
http://www.ladwp.com/resserv/coninfo/refrig/ecs2.htm
http://www.energydepot.com/Jackson/library/refrfrez.htm
More Cool Facts about household technology:
http://www.cool-fact.com/archive/1997/03/24.html
http://www.cool-fact.com/archive/1999/04/15.html
http://www.cool-fact.com/archive/1999/05/25.html
Why does "knuckle down"
mean get to work?
These days the workplace in many places is going through
some drastic changes. For example, in the United States
the dress code in many industries is becoming decidedly
more casual. But employers still expect their people to
remember that they are not at the office to play games.
They have to knuckle down and get to work.
Well it so happens that if you knuckle down you're
echoing an
old game: marbles. Played for many centuries in England
and also popular in American cities till about 50 years
ago, marbles involves hitting spherical pieces of colored
stone or glass with a flick of the finger. If you're
serious and want to shoot the marble the right way, you
have to have your knuckles touching the ground. You have
to knuckle down, an expression that began in the streets
and ended up in the corporate suites.
(Source: WHY YOU SAY IT by Webb Garrison)
FAST FACTS:
George Washington wasn't the first President of the
United States. John Hanson was. He was elected by the
Constitutional Congress to the office of the President of
the US in Congress Assembled.
Maybe when they were writing history they asked who was
the first President, Washington said, "It was me."
Of course that also blows that "can't tell a lie"
thing right out of the water, too.
(Source: 2201 FASCINATING FACTS)
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