Originally Posted by CyberSEO

I will help you my Finnish friend. So here we go:

m = E / c^2 is the formula invented by Einstein and every kid here knows it. Let me explain it to you in the concept of the Big Bang Theory. We take pure energy (E in Joules) which has no mass ("no", means absolutely no), divide it by the light speed (c in meters per second) multiplied by itself and... get the mass outcome (m in kilograms) produced during the explosion.

Means that every citizen must learn it in the school. If a kid doesn't visit school, he will be taken out of family and will be forced (literally forced) to visit school in orphanage. The mandatory minimum in Russia is a 9 grade school and Einstein's theory of relativity is included into that education program. You may stay in school for more 2 years and then go to the university, but 9 grades is "a must". I feel a bit strange when explaining the basics of our education to such a serious expert of Russia like you.

See my explanation above.

Yes, his formula has been proven many times. For example, the nuclear bomb won't exist if it didn't work.