A frog croaks from a walking trail. A hiker snaps a photo and uploads it to iNaturalist. That single act—one person, one ...

Lucy, a 3.2 million old fossil skeleton of a human ancestor of Ethiopia, is set to be displayed in Europe for the first time; ...

Leylah Fernandez is up to No. 24 after her biggest career title, Venus Williams returns to the rankings at 45 years old and Taylor Townsend reaches No. 1 in doubles.