"Mass and energy are identical in nature." A.E
Wich is means:
E=mc2
This is good for people interested in the subject but yet thinking it is too complex or that you have to be a physic or math expert:
http://www.alberteinstein.info/PDFs/...lish_pp3-6.pdf
I call Relativity:
"How to explain that Mind and Soul exist as well as the Body."
3 expressions of the same being: 2 energetical (M and S) and 1 material (B)
Great subject.