State something that has been proven.?

Question

Of course, proofs are extremely elusive. But, it can be anything.

Answer 1

the pythagorean theorem
a^2 + b^2 = c^2

Answer 2

Galileo said two objects of different masses will fall to the earth at exactly the rate and land at the same time on Earth. This was proved in an environment that was a vacuum where there was no air resistance.This was done on the Apollo 15 moon walk with a hammer-feather drop.

Answer 3

1 + 1 = 10 in binary arithmetic.
1 + 1 = 2 in a number system to any base 3 and above.

Answer 4

You can't detach your head, roll it down the street, run after it and put it back on.

You can't give birth to a child if you are a man and if you are a woman you can't give birth to an elephant.

Gravity.

Existence.

That a feather doesn't weigh more than a mountain.

That you can't walk to Mars from here.

That you can't perceive that you are Brad Pitt and actually become Brad Pitt.

That you can't survive naked in sub-zero weather for a week with no shelter.

You can't poop out your mouth (despite a recent South Park episode to the contrary).

That you can't live forever.

That you can't make a silk purse out of a sow's ear.

Answer 5

When you get right down to it, nothing can be proven. To prove something, it must be tested (going to the base root meaning of prove - provare: to test). So until something happens, it cannot be proven.

There are strong likelihoods but nothing is proven in an all-emcompassing way.

Answer 6

Postulate 12: Vertical angles are congruent.

That good?

Answer 7

In spite of all efforts or lack thereof : History repeats itself.

Answer 8

Snowflakes can't get pimples. Or did somebody already mention that?

Answer 9

Wheels make things roll, so my answer is...yes. Puzzling question though

Answer 10

The earth is a sphere.