In the days of Christopher Columbus, everyone thought the world was flat.
In the middle of the third century B.C., Aristotle declared that the Earth was spherical. When Colombus sailed in 1492, he knew Earth was a sphere.
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15
Albert Einstein failed math class.
Einstein himself claimed that he was at the top of his class in primary school. "Before I was 15, I had mastered differential and integral calculus".
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15
Bulls get angry when they see the color red.
Bulls (like other cattle) are red-green colorblind. They actually triggered by the movement of the cape.
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15
We only use 10 percent of our brains.
Humans "use virtually every part of the brain" and most of the brain is "active almost all the time."
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15
Goldfish only have a three-second memory.
Several studies throughout the yearsâsome research even indicates goldfish could have a memory span of up to five months long.
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seesaw
Swap points!
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shark
Other team loses 25 points!
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gift
Win 20 points!
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thief
Give points!
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heart
Other team wins 20 points!
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gift
Win 20 points!
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fairy
Take points!
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thief
Give points!
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seesaw
Swap points!
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star
Double points!
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shark
Other team loses 10 points!
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baam
Lose 20 points!
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15
Shaving your hair makes it grow back thicker.
Shaving your hair doesn't make it change in color or thickness. All it does is give the hair a blunt tip, which might feel more coarse as it grows out.
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15
Napoleon Bonaparte was extremely short.
However, Bonaparte was most likely average height at just over 5'5" (165cm) tall, History says.
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15
You'll get cramps if you go swimming right after you eat.
The body requires extra blood in order to digest, but not nearly enough to prevent the muscles in your arms and legs from working as they should.
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15
The Great Wall of China is the only man-made structure visible from space.
NASA images prove you can see "highways, airports, bridges, dams, and components of the Kennedy Space Center."
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15
Dogs only see in black and white.
Veterinarian Barbara Royal explained that dogs "don't see all of the colors that we see, but they can actually distinguish between colors."
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15
Your hair and fingernails continue to grow after you die.
The skin around a person nails and hair retracts over time due to dehydration of the body, not because their hair and nails are actually growing.
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15
You need to drink at least eight glasses of water every day.
The amount of water you need daily depends on several different factors, like your overall health, your activity levels, and where you live.
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15
The sun is yellow.
In reality, "the sun is essentially all colors mixed together, which appear to our eyes as white."