To recognize strange extraterrestrial life and solve biological mysteries on this planet, scientists are searching for an objective definition for life’s basic units. More than half a billion years ...

People often feel that they can intuitively recognize whether something is alive, but nature is filled with entities that flout easy categorization as life or non-life — and the challenge may ...

THE present work contains definitions of about 10,000 terms, including several hundred lately coined expressions, many of which have not hitherto appeared in a dictionary. In a first edition all the ...