thomas gold's theory on how petroleum may be created not from fossilized plants, but from methane deep in the earth's crust. meanwhile, bacteria in the crust slowly eat away at the oil as a food source.
this is a great read; see pdf download link on the page.
if the theory is right, we will have an enormous supply of petroleum -- not that i'd advocate wasting any... and yes, we should vigorously pursue alternative, unlimited, nonpolluting energy sources.
i'm pretty sure they're NOT saying the core is shaped like a cube... it's just that the iron atoms inside the core are arranged at 90 degree angles to each other