Theoretical physicists use machine-learning algorithms to speed up difficult calculations and eliminate untenable theories—but could they transform what it means to make discoveries? Theoretical ...

In September 2015, cosmonaut Gennady Padalka arrived back on Earth for the last time. He had just completed his sixth mission in space, and broke the record for the most cumulative time spent beyond ...

Have you ever made a mistake that you wish you could undo? Correcting past mistakes is one of the reasons we find the concept of time travel so fascinating. As often portrayed in science fiction, with ...