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Author Topic: Some Myths - Tackled.  (Read 3412 times)

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Some Myths - Tackled.
« on: July 16, 2011, 09:07:43 PM »
 
 
Some of the most familiar wives tales and urban legends, plus some that sound dubious but which turn out to be true. You know them, now let’s bust them


It takes seven years to digest gum: While it may prove a bit more difficult to break down than organic foodstuffs, chewing gum gets no special treatment from the digestive system. Doctors figure this old wives’ tale was invented to prevent kids from swallowing the rubbery substance.


Believe It or Not  Most Popular and Interesting Myths


The Great Wall of China is the only man made structure visible from space: There are several variations on this folkloric statement, and they’re all quantifiably false. Astronauts can spot the Great Wall from low-Earth orbit, along with plenty of other things like the Giza pyramids and even airport runways. But they can’t see the Wall from the Moon.


Believe It or Not  Most Popular and Interesting Myths


A penny dropped from the top of a tall building could kill a pedestrian: A penny isn’t the most aerodynamic of weapons. A combination of its shape and wind friction means that, tossed even from the 1,250-foot Empire State Building, it would travel fast enough merely to sting an unlucky pedestrian.


Believe It or Not  Most Popular and Interesting Myths


There is no gravity in space: Blame the term “zero-gravity” for this common misconception. Gravity is everywhere, even in space. Astronauts look weightless because they are in continuous freefall towards the Earth, staying aloft because of their horizontal motion. The effect of gravity diminishes with distance, but it never truly goes away. Oh, and while we’re at it, it’s also untrue that space is a vacuum. There are all kinds of atoms out there, albeit sometimes far apart (and this thin gas adds to the collective gravity budget, too!)


Believe It or Not  Most Popular and Interesting Myths




Humans use only 10 percent of their brains: This media darling has been around for at least a century. Fortunately, it’s just not true. MRI imaging clearly demonstrates–with fancy colors no less–that humans put most of their cerebral cortex to good use, even while dozing.


Believe It or Not  Most Popular and Interesting Myths


Water drains backwards in the Southern Hemisphere due to the Earth’s rotation: Not only is the Earth’s rotation too weak to affect the direction of water flowing in a drain, tests you can easily perform in a few washrooms will show that water whirlpools both ways depending on the sink’s structure, not the hemisphere.


Believe It or Not  Most Popular and Interesting Myths


Animals can predict natural disasters: There is no evidence that animals possess a mysterious sixth-sense allowing them to predict natural disasters. Their keen senses of smell, hearing, and sharp instincts alone are enough to send them scattering for the hillsides during a hurricane or tsunami. And even so, animals often die during natural disasters, so if they do have some sort of sixth sense, it’s not worth much.


Believe It or Not  Most Popular and Interesting Myths


A dog’s mouth is cleaner than a human’s: Despite a habit of licking things no human would dare, Fido’s mouth is often touted as scientifically more sterile. Truth is, oral bacteria are so species-specific that one can’t be considered cleaner than the other, just different.


Believe It or Not  Most Popular and Interesting Myths


Lightning never strikes the same place twice: In fact lightning favors certain spots, particularly high locations. The Empire State Building is struck about 25 times every year. Ben Franklin grasped the concept long ago and mounted a metal rod atop the roof of his home, then ran a wire to the ground, thereby inventing the lightning rod.


Believe It or Not  Most Popular and Interesting Myths


Yawning is contagious: Empirically, this is tough to deny; perhaps you’ll yawn while reading this. The real question is whether there’s actually something physiological at work here, and the answer is likely yes: even chimpanzees mimic each other’s yawns


Believe It or Not  Most Popular and Interesting Myths

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