We are entering an increasingly dangerous period of our history. But I'm an optimist.
Stephen HawkingBecause imaginary time behaves like another direction in space, histories in imaginary time can be closed surfaces, like the surface of the Earth, with no [existential] beginning or end.
Stephen HawkingEvolution has ensured that our brains just aren't equipped to visualise 11 dimensions directly. However, from a purely mathematical point of view it's just as easy to think in 11 dimensions, as it is to think in three or four.
Stephen Hawking