The Conservapedia, they really are fucking stupid.
E=mc² is Einstein’s famous formula which asserts that the energy (E) which makes up the matter in any body is equal to the square of the speed of light (c²) times the mass (m) of that body. It is a meaningless, almost nonsensical, statement that purports to relate all matter to light. In fact, no theory has successfully unified the laws governing mass (i.e., gravity) with the laws governing light (i.e., electromagnetism), and numerous attempts to derive E=mc² in general from first principles have failed. Political pressure, however, has since made it impossible for anyone pursuing an academic career in science to even question the validity of this nonsensical equation. Simply put, E=mc² is liberal claptrap.