A long-standing puzzle known as Fermi’s Paradox. Broached nearly 70 years ago by physicist Enrico Fermi, it rests on the fact that the universe is very old. Consequently, if intelligent life is commonplace, then some of it is surely advanced enough to have colonized the entire galaxy. We should see evidence of aliens everywhere. The fact that we don’t might be explained by Ball’s hypothesis — we’re being deliberately isolated.
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Brian Randolph Greene is an American theoretical physicist and mathematician. Greene was a physics professor at Cornell University from 1990–1995, and has been a professor at Columbia University since 1996 and chairman of the World Science Festival since co-founding it in 2008. Greene has worked on mirror symmetry, relating two different Calabi–Yau manifolds (concretely relating the conifold to one of its orbifolds). He also described the flop transition, a mild form of topology change, showing that topology in string theory can change at the conifold point.
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