Physicists have created a new type of time crystal that may help confirm some fundamental theories about quantum interactions. A standard time crystal is a new phase of matter that features perpetual ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...

The original version of this story appeared in Quanta Magazine. At the turn of the 20th century, the renowned mathematician David Hilbert had a grand ambition to bring a more rigorous, mathematical ...