Body language expert Judi James referred to it as a 'death clasp.' 'With the eyes and the fate of the world currently resting on their shoulders,' James told DailyMail.com, 'this latest handshake ...

Her blog post includes an audio clip so that you can play back the full handshake sounds. The main box on the graphic shows the audio spectrum from that clip, with an explanation below it.

Over a 12-year span, two groups of chimpanzees maintained distinct, consistent styles of clasping hands while grooming one another, according to a study published May 26 in Biology Letters. The study ...