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What existed before the Big Bang? - BBC
Stephen Hawking Says He Knows What Happened Before the Big Bang
What Existed Before the Big Bang? - HowStuffWorks
What happened before the Big Bang? - Live Science
What was before the Big Bang? Everything you need to know
The Myth Of The Beginning Of Time | Scientific American
What Came before the Big Bang? - Scientific American
What happened before the Big Bang? - Live Science
What Came Before the Big Bang? - WIRED
What Happened Before the Big Bang? - Center for Astrophysics