During that first Earth Day speech, Senator Nelson added the "environment is all of America and its problems". He highlighted the environmental problem was heightened by the government spending ...

Wild chimpanzees alter the meaning of single calls when embedding them into diverse call combinations, mirroring linguistic operations in human language. Human language, however, allows an infinite ...

Humans are the only species on Earth known to use language. They do this by combining sounds into words and words into ...

Chimpanzees combine hoots, calls and grunts to convey far more concepts than with single sounds alone. It may be a first among nonhuman animals.

Slideshows ...