When buttons were invented, they
were very expensive and worn primarily by the rich. Because wealthy
women were dressed by maids, dressmakers put the buttons on the maid's
right. Since most people are right-handed, it is easier to push buttons
on the right through holes on the left. And that's where women's
buttons have remained since.
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When the Chilean earthquake occurred in 1960, seismographs
recorded seismic waves that traveled all around the Earth. These
seismic waves shook the entire earth for many days! This phenomenon is
called the free oscillation of the Earth.
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When the presentation gets to the number
"seven" you will notice that the 7 has a line through the middle of it.
That was the way the Arabic 7 was originally written, and in Europe and
certain other areas they
still write the 7 that way. Also, in the military, they commonly
write it that way.
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An obese woman was admitted to a
Queensland hospital with stomach pains, it turned out that her T.V.
remote control was stuck in between rolls of fat and had eventually
become an abscess.
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A googol is a 1 followed by 100 zeros. Mathematician Edward Kasner supposedly asked his nephew Milton Sirotta to suggest a name for the number, and he came up with this word.
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"Adcomsubordcomphibspac" is the longest acronym. It is a Navy term standing for Administrative Command, Amphibious Forces, Pacific Fleet Subordinate Command.
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The reason wheels seem to spin backwards on a camera is because when you film something, you are really taking a series of still images and then replaying them so fast that the eye is fooled into thinking it is a continuous stream of images. The eye can see about 12-14 frames per second. Because of a physical law called the Nyquist Sampling Theorem you need to display frames twice as fast as the eye can see to fool it into seeing it as a continuous movie (Nyquist showed mathematically why that is true). So, imagine you have a wheel that is spinning exactly once every second. If you took a picture at the same rate, it would look like it is standing still. That's because it rotates exactly once every time you take a picture. Now take a picture just a little bit faster than 1 per second. Now every time you take a picture, the wheel has not quite made it all the way around; maybe it will have gone 350 degrees around, so it's 10 degrees behind the first frame. The next frame it will have gone another 350 degrees, making it now 20 degrees behind the first frame, and so on. When you play the film back, it will look like the wheel is moving backwards, even though you know it was going forwards. The opposite effect happens when you take pictures a bit slower than the rotation rate. It gets more complicated when the wheel does not rotate at a constant rate, like when a car accelerates. The next time you watch TV or go to the movies, watch the wheels as a car speeds up. You might see the wheel appear to go backwards, them stop, then go forwards, all while the car is moving forwards.
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Animals
