They aren’t the only ones who sometimes feel nostalgic for times that were difficult, unpleasant, or downright bad. Some soldiers returning from war long for the camaraderie and purposefulness of the ...

You may think that time started 13.8 billion years ago at the birth of the universe, but physicists with alternative ...

Projections of our future under climate change paint a picture of extreme weather and acidified oceans, a world many of today ...