Myth Busters

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The Great Wall of China is not visible from space

Though the Great Wall is, admittedly, pretty big (it runs for over 1,500 miles), there's no way you can see this structure from space.You can't even see the Great Wall from low orbit. No astronauts have reported seeing human-made objects from space.

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The Great Wall of China is not visible from space
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We do not use just 10% of our brains

Brain imaging research shows that just about all of our brain is used over the course of a day. Brain function isn't extremely localized: different parts of the brain handle different functions, and this is spread throughout the brain - there is no 90% of unused gray matter lying around up there.

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We do not use just 10% of our brains
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Dogs don't sweat by salivating

In truth, dogs have sweat glands all over their body. They sweat primarily through their footpads. When they are panting, they are helping to regulate body temperature, much like we do.

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Dogs don't sweat by salivating
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Human beings do not have only five senses

Although scientists disagree on the exact definition and number of senses, some of the others listed include: a sense of balance, acceleration, pain, body position, and relative temperature. There's even senses of time, itching, hunger, and blood carbon dioxide levels, just to name a few -and there are up to 20.

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Human beings do not have only five senses
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Bulls are not enraged by the color red

Bulls are not enraged by the color red,but bulls are color blind. Being dichromats, it isn't the color of the cape that bothers them, but the movement of the fabric. This incites the bull to charge.

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Bulls are not enraged by the color red
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You can put birds back in their nests if you have to

While messing with a nest may cause a mother to temporarily flee, this is due to visual cues, not smell. But even so, birds are limited in their olfactory sense and can't differentiate human from bird. Putting a bird or egg back in the nest - if the bird is supposed to be there - will not lead to rejection.

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You can put birds back in their nests if you have to
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Hair and nails do not continue to grow after death

Hair and nails only look like they have grown after death. The skin around these areas begins to lose water and shrink, giving the hair and nails the appearance of having grown. The fact is, when you're dead, not much is going to be happening growth-wise.

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Hair and nails do not continue to grow after death
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Goldfish actually have long memory spans.

In reality, goldfish have a memory span of up to three months. They can be taught to follow a routine and can tell time. Even high school students have gotten in on the action of disproving this myth.

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Goldfish actually have long memory spans.
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You cannot get warts from toads.

A possible source of this myth is that some toads have poison glands that make humans break out in a rash that looks like warts. But just remember: they're not.

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You cannot get warts from toads.
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Waking sleepwalkers does not harm them

But waking a sleepwalker from their dream will leave them momentarily disoriented or confused, that's all. There is no real danger in waking them up. In fact, sleepwalkers can sustain injuries if they continue to walk around. You'll be doing them a favor by shaking them out of it.

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Waking sleepwalkers does not harm them
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Sharks can get cancer

Sharks have strong, complex immune systems that include an angiogenin inhibitor in their cartilage. This, however, does not prevent carcinomas from developing in sharks. There are instances of tumors in sharks on record. This myth has led to a decrease in shark population and the use of shark cartilage for cancer prevention treatment, which doesn't work.

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Sharks can get cancer
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