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We spend it, waste it and never seem to have enough of it – but what exactly is time?
In the quest to understand, we have developed super-accurate atomic clocks, probed the realm of quantum mechanics, and even messed with causality.

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Carlo Rovelli, a physicist at Aix-Marseille University in France, uses his time to try to figure out this most fundamental question, and he’s coming to share his answers at New Scientist Live.
It’s a subject that touches a huge range of scientific disciplines, from the deep physics of Albert Einstein’s theory of general relativity to the neuroscience of how we humans experience the ticking seconds.
Rovelli, best-selling author of The Order of Time and one of the world’s leading thinkers on time, will bring them all together when he takes to the Main Stage of New Scientist Live on 22 September.
New Scientist Live is our award-winning festival of ideas and discoveries. The four-day event will feature more than 120 speakers giving thought-provoking talks on everything from the secret life of the teenage brain to the legacy of Stephen Hawking.