Einstein would be proud
One person on a site I use has 'assembled physics notes' for all high-school students 'despite being only thirteen'. Here's one nice gem:
What does E=MC^2 mean?
Energy=Matter traveling at the (speed of light Squared)
or even more simply.
if matter was to trasvel at the speed of light squared
which can be calculated like this
186000 Km/h * 186000 Km/h=34596000000 Km/h
it would turn into energy