Humans and apes have shared a laugh for 15 million years, says study

A new study suggests that Great Apes laugh in a similar way to humans. Researchers analysed old recordings of a variety of apes and found that their laughter shared some common characteristics to that of their human relatives, meaning apes may have had a distant ancestor that laughed 15 million years ago. Scientists also say the laughter of apes also provides a clue to the evolution of human speech.