Robots have learned how to communicate with each other by creating their own language, a new report explains. Experts at artificial intelligence research group OpenAI conducted an experiment that ...

It’s impossible to state the exact number of words in the English language because new words are added every day. It could be as many as a million and counting… Words can have more than one meaning.

Some people can speak a seemingly impossible number of tongues. How do they manage it, asks David Robson, and what can we learn from them? Best of 2015 Our top stories This is part of BBC Future’s ...