Comment the tarahumara-s (Score 0) 376
the tarahumara's are one of the best examples of that "out-jog"
http://en.wikipedia.org/wiki/Tarahumara
http://en.wikipedia.org/wiki/Tarahumara
There's no inherent limit to the amount of kinetic energy we can put into a particle of any mass. The issue for interstellar travel is getting the energy, not applying it. Energy on that scale has an awful lot of mass.
actually...the max energy density is 1 planck energy unit in a sphere of diameter of 1 planck length: http://en.wikipedia.org/wiki/Planck_energy
Anyone can make an omelet with eggs. The trick is to make one with none.