Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

Exceptionally preserved fossils from the Ediacaran period challenge what scientists thought was possible in sandstone. In the fossil record, creatures without hard shells or skeletons, such as ...

Hundreds of protesters have been killed; Trump is threatening military action; and at least one Iranian official has brushed ...

Does a cuckoo know it's a cuckoo? The answer is more difficult than you might think, explains Richard Pallardy ...