The US has formally exited WHO, but left behind roughly $260 million in unpaid dues. Here’s what the debt is, why it matters, ...

Dark matter seems invisible, but it makes up most matter, and we have evidence that it gives the cosmos its shape. Now ...

For forty years, the “Standard Model” assumed dark matter must be cold. If it moved too fast (which would have made it hot), ...

We experience the flow of time because it’s a natural outcome of the basic laws of physics. But we may need to build a whole new model to account for gravity’s influence.

Chemists at UCLA are showing that some of organic chemistry’s most famous “rules” aren’t as unbreakable as once thought. By creating bizarre, cage-shaped molecules with warped double bonds—structures ...