Why Do We Need Quantum Gravity to Explain the Big Bang?

Harry Cliff gives three reasons why we may never be able to probe the very first moments of our Universe.
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Harry Cliff is a particle physicist at the University of Cambridge working on the LHCb experiment, a huge particle detector buried 100 metres underground at CERN near Geneva. He is a member of an international team of around 1400 physicists, engineers and computer scientists who are using LHCb to study the basic building blocks of our universe, in search of answers to some of the biggest questions in modern physics.

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