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17 Facts That Are 100% True And 100% Freaky

Most people have an above-average number of arms.

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1. In a room with just 23 people in it, there's a 50% chance two of them share a birthday.

You might think the odds are 23 out of 365 or something, but nope — it's just over 50%.
Disobeyart / Getty Images

You might think the odds are 23 out of 365 or something, but nope — it's just over 50%.

2. If you folded a regular piece of notebook paper in half 45 times, it would be thick enough to reach the moon.

Granted, it's not actually possible to fold a piece of paper in half that many times. But if you could, 45 folds would bring you to the moon. That's the power of exponents, y'all!
TED-Ed

Granted, it's not actually possible to fold a piece of paper in half that many times. But if you could, 45 folds would bring you to the moon. That's the power of exponents, y'all!

3. Every time you shuffle a deck of cards, you are likely the first person in the history of the universe to create that exact sequence.

There are 8 x 1067 possible ways to shuffle a deck of cards — that means there are more ways to shuffle a deck than there are atoms on Earth. Most possible card sequences have never been shuffled before, so every time you play Go Fish, you're likely to make history.
rehtse_c / Getty Images

There are 8 x 1067 possible ways to shuffle a deck of cards — that means there are more ways to shuffle a deck than there are atoms on Earth. Most possible card sequences have never been shuffled before, so every time you play Go Fish, you're likely to make history.

4. It takes just 12 days for a million seconds to pass. But a billion seconds takes almost 32 years.

And a trillion seconds? 31,709.8 years.
Gankatt / Getty Images

And a trillion seconds? 31,709.8 years.

5. One 17-inch pizza is more food than two 12-inch pizzas.

NBC

I'll let you do the math on this one if you don't believe me, but here's a hint: Area = πr2.

6. You know those dotted lines on the road that separate lanes? Most drivers estimate them to be 2 feet long. In actuality, each of those stripes is 10 FEET LONG.

Your brain doesn't always interpret geometry correctly! Scientists have attributed this common misconception to a phenomenon known as "size constancy."
Chinaface / Getty Images

Your brain doesn't always interpret geometry correctly! Scientists have attributed this common misconception to a phenomenon known as "size constancy."

7. What about traffic lights? Yeah, most people don't realize how big those things are, either.

Size constancy strikes again!
JonnyBoiiii / Via reddit.com

Size constancy strikes again!

8. Most people have an above-average number of arms.

Since some people have no arms or one arm, the average number of arms a person has is somewhere just under two. So if you have two arms, you've got more arms than average.
Milkos / Getty Images

Since some people have no arms or one arm, the average number of arms a person has is somewhere just under two. So if you have two arms, you've got more arms than average.

9. There's a number out there called Graham's number. It's so large that trying to interpret it might literally turn your brain into a black hole.

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Your brain can only contain so much info, and Graham's number has more digits than any human brain can hold. According to a physicist from the University of California, Irvine, trying to store all of Graham's number in your brain would turn it into a black hole.

10. There's also a number called a googolplex, which is so large that there's not enough room in the ENTIRE UNIVERSE to write it down.

There are more digits in a googolplex than there are particles in the whole universe.
Twitter: @gurkanilhanfb

There are more digits in a googolplex than there are particles in the whole universe.

11. If you're having trouble calculating a percentage, just flip it. 4% of 50 is the same as 50% of 4. 80% of 25 is the same as 25% of 80.

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This works with any percentage. Seriously, try it!

12. If someone tells you they have two kids and one is a boy, the odds that the second child is a girl are two out of three, NOT 50-50.

Now, we're talking probability here, NOT biology. From a biological perspective, it's a 50-50 shot, like you'd probably assume. But in terms of mathematical probability, there's a two-out-of-three chance the other kid's gonna be a girl. Numbers are cray!
Yurolaitsalbert / Getty Images

Now, we're talking probability here, NOT biology. From a biological perspective, it's a 50-50 shot, like you'd probably assume. But in terms of mathematical probability, there's a two-out-of-three chance the other kid's gonna be a girl. Numbers are cray!

13. Imagine you have a rope long enough to wrap around the entire circumference of the globe. The rope is 24,901.55 miles long. You now want to lengthen the rope so that it can hover one foot off the ground at all points on Earth. How much more rope do you need to make this happen? Just 6.28 feet.

Yep, just 6.28 extra feet of rope will give you an extra foot of clearance across the entire planet.
ipopba / Getty

Yep, just 6.28 extra feet of rope will give you an extra foot of clearance across the entire planet.

14. And what if you want to do the exact same thing, but with a tennis ball? Let's say your rope is currently 8 inches long. How much more rope do you need to give a foot of clearance around the entire ball? 6.28 feet — just like in the globe example.

No matter the size of the ball, the answer will always be 6.28 feet, or 2π.
Sashkinw / Getty Images

No matter the size of the ball, the answer will always be 6.28 feet, or 2π.

15. There's a 3D shape called Gabriel's Horn, which has infinite area BUT a limited volume. In other words, you could fill the horn with paint, but you couldn't actually paint it.

heidi666 / Via imgur.com

It's a mind-bending geometric paradox.

16. Statistically speaking, your friends will always have more friends than you do.

Paramount

You know how the people you follow on Twitter tend to have more followers than you do? That's a real mathematical phenomenon called the "friendship paradox," and it's true for real life, too.

17. And finally, to calculate the volume of this deep-dish pizza, you would simply use the formula: Pi x Z x Z x A.

Z is the radius of the pizza and A is the height.
Bhofack2 / Getty Images

Z is the radius of the pizza and A is the height.

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