Well more than 100 distinct sign languages exist worldwide, with each having features that made it possible for researchers to create an evolutionary tree of their lineages.

A new study suggests the unique human version of the NOVA1 protein developed after our ancestors split from Neanderthals on the evolutionary tree, and it might have given us a competitive edge ...

Douglas and senior scientist Peter Wills applied the model to cephalopods (including octopuses, squids, cuttlefish, and vampire squids), as well as to the evolution of Indo-European languages, and ...