Add Yahoo as a preferred source to see more of our stories on Google. How many times have you looked at your baby — especially when he was wailing — and desperately wondered what he wanted? Like most ...

Before we answer that question, it might be useful to first consider what a “language” is. Spoken languages are naturally developed complex systems that use a set of conventionalised sound-based ...

There is so much more to sign language than the hands, as interpreter Christine Dudley demonstrates. Carlo Allegri/Reuters Most people are familiar with sign language, the system that deaf people use ...