A longstanding mystery of the periodic table involves a group of unique elements called lanthanides. Also known as rare earth ...

White, purple, and yellow. The women’s movement didn’t rely on visual symbols at first, notes historian Einav Rabinovitch-Fox. That changed in the early 20th century, when suffragists in ...

Our readers explain why burning our planet's naturally occurring hydrogen won't deplete levels of atmospheric oxygen – there would need to be far more of it for this to be a problem Last Word is ...