Quantum Physicist Takes Aim at the Universe's Mysterious Arrow of Time

Physicist Jim Al-Khalili is the author of "On Time: The Physics That Makes the Universe Tick." (Credits: Clockwork photo adapted from Dietmar Rabich / Wikimedia Commons / Dülmen, Heilig-Kreuz-Kirche, Uhrwerk -- 2019 -- 3054. Al-Khalili image: Princeton University Press. Created under CC BY-SA 4.0 license)

Scientists and philosophers have argued over the nature of time since … well, since time immemorial. Is time real, or is it a convenient illusion? Why does time seem to flow in just one direction? In a new book called “On Time,” British physicist Jim Al-Khalili lays out what he thinks is the answer to such questions.

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