"It followed from the special theory
of relativity that mass and energy
are both but different manifestations
of the same thing -- a somewhat unfamilar
conception for the average mind.
Furthermore, the equation E is equal
to m c-squared, in which energy
is put equal to mass, multiplied
by the square of the velocity of light,
showed that very small amounts of mass
may be converted into a very large amount of energy and vice versa.
The mass and energy were in fact equivalent, according to the
formula mentioned before. This was demonstrated by
Cockcroft and Walton in 1932, experimentally."
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