You’ve held it, spent it, and probably never looked twice — but your money is hiding secrets. From tiny symbols to hidden faces and overlooked artwork, U.S. and Canadian currency is full of hidden ...

If you're focusing on your health this year, plate of microplastics might not be the first thing you think about when cooking. But these tiny plastic particles are everywhere -- in our water, in the ...

Using marijuana just once or twice a month was associated with worse school performance and emotional distress for teens, according to a large national study of adolescents led by Ryan Sultán, an ...

Researchers at the Francis Crick Institute and AlveoliX have developed the first human 'lung-on-chip' model using stem cells taken from only one person. These chips simulate breathing motions and lung ...