Artificial light is rightly considered a major social, cultural and economic achievement. Yet, artificial light at night is also said to pose a threat to biodiversity, especially affecting nocturnal ...

Dear Dr. Universe: Why do some apple trees produce more apples than others? Some produce almost none! – Alyssa, 11, Washington state I can never turn down a juicy apple. I asked my friend Kate Evans ...

Over the last 10 days, activists have taken up residence in a tree in Seattle’s Wedgewood neighborhood. Their goal: Save the 80-foot Western red cedar named Luma. The tree sits in the middle of a lot ...