By chewing on the problems posed by “extremal” black holes, physicists have exposed a surprising and universal connection between energy and entropy.
The laws of physics imply that the passage of time is an illusion. To avoid this conclusion, we might have to rethink the reality of infinitely precise numbers.
Sometimes a mirror that reflects 99.9999% of light isn’t good enough.
In a new paper, physicists argue that hypothetical particles called axions could explain why the universe isn’t empty.
By teaching machines to understand our true desires, one scientist hopes to avoid the potentially disastrous consequences of having them do what we command.