Physics Today: At a packed auditorium at the Quantum to Cosmos: Ideas for the future festival held at the Perimeter Institute, in Waterloo, Canada, a panel of physicists was asked to respond to a single question: "What keeps you awake at night?"
The responses ranged from Why this universe? What is everything made of? How does complexity happen? Will string theory ever be proved correct? What is reality really? to How far can physics take us?
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