So basically to be uber geeky you should start espousing e=mc2 + mv2/2?
E^2 = m^2 c^4 + p^2 c^2
(Set momentum, p, to zero and divide everything by itself to get E = mc^2 again.)(From http://www.wolframalpha.com/input/?i=Series[%28m0*c^2%29%2FS...] )
http://www.wolframalpha.com/input/?i=population+of+japan+/+(...)