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"If determinism — the predictability of the universe — breaks down in black holes, it could break down in other situations. Even worse, if determinism breaks down, we can’t be sure of our past history either. The history books and our memories could just be illusions. It is the past that tells us who we are. Without it, we lose our identity," said Stephen Hawking.

Hawking at Harvard

At packed Sanders Theatre, theoretical physicist and cosmologist tackles the contradictory qualities of black holes