WASHINGTON, Feb 28 (Reuters) - Director James Cameron's "Avatar" movies are populated by a species of outsized blue beings resembling humans, except with tails. So why does our species lack a tail, ...

WASHINGTON (Reuters) - Director James Cameron's "Avatar" movies are populated by a species of outsized blue beings resembling humans, except with tails. So why does our species lack a tail, ...

The gene-editing technique known as CRISPR is promising to revolutionize medicine. Some researchers are trying to help make it available for people with very rare genetic disorders. A gene-editing ...