New restrictions on teaching about race and gender are unsettling faculty; conservatives say the moves are overdue.

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Time travel is deterministic and locally free, a paper says—resolving an age-old paradox. This follows research observing that the present is not changed by a time-traveling qubit. It’s still not very ...

Knowledge gained by combining measurements and simulations leads to increased confidence in the safety of products, as Louise Wright explains.

Flow chemistry is the development and study of chemical reactions whereby reactants are combined by pumping fluids, including solutions of reagents, through tubes at known rates. The relative ...