Â鶹Éç

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Physicist Carlo Rovelli first became interested in the nature of time when he took LSD as a young man. Later he became curious about the world of the almost absurdly small, down at the quantum level, where time has no meaning and space is grainy. He talks about how he thinks about time and space and the theory of quantum loop gravity. (Image: Physicist Carlo Rovelli with Jim Al-Khalili, Credit: Â鶹Éç.)