.../watch?v=YE5xmFAcW-U All animals yawn (see animalyawns.com) and in humans yawning seems to be contagious. Seeing another person yawn,... lecture in Sheffield last week about yawning - in the introduction he told us ... social signal... ...Another possible function for yawning amoung primates - including ourselves - is that ...now". It's not clear, however, why yawning would take on this role...

...other. When it was hot, both panted. If one yawned, so did the other. Not all their emotions were ...over the winter, Ffirth hypothesised it was not a contagious disease. He reckoned it was caused by an excess .... Yellow fever, as we now know, is very contagious, but it requires direct transmission into the bloodstream, ...goes into a kind of trance. That may explain why it's easy to doze off, even in ...