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.
Three physicists stumbled across an unexpected relationship between some of the most ubiquitous objects in math.
Most every cosmologist believes the universe is flat. A new analysis argues that it’s closed.