MADISON — What if the speed of light is a constant only most of the time? What if gravity sometimes pushed instead of pulled? Scientists are increasingly asking what would seem like far-out questions ...

The molecular hydrogen ion H₂⁺ is the simplest molecule. This simplicity makes it a perfect study object for physicists, as ...

The ion of the hydrogen molecule is ideally suited for making ultra-precise measurements of important physical constants.

Cars are getting smarter every day — whether assisted by A.I. or equipped with advanced safety sensors like backup cams — but these advancements have done little to actually prevent traffic accidents.