Quote by Brian Greene
"Gravity is not a force in the traditional sense, but a curvature of spacetime caused by mass and energy."
More from Brian Greene
"The universe is a pretty big place. If it's just us, seems like an awful lot of wasted space."
"String theory envisions a universe in which there are more dimensions than the four we observe."
"Physics is really nothing more than a search for ultimate simplicity, but so far all we've found is ultimate complexity."
"The universe doesn't owe us comprehensibility."