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Chimpanzees Throwing Rocks at Trees: Ritual, Spiritual, or Just Clean Fun?

One commonly observed behavior of some chimpanzees is that they like to throw rocks at trees--especially resonant trees that produce a deep, full sound. But why? New research questions whether it is a ritual at all, and especially whether it is indicative of emerging spirituality: https://www.newsweek.com/chimp-throw-rocks-trees-communication-1477637. The original journal article may be found here: https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0747 (access required)

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How do we make all those colors with our mouths?

In chapter 5 we encounter the incredible case of the descending larynx. This marvelous evolutionary adaptation allows us a much greater variety of mouth sounds. Now Tori Bloom sends us an internet mod

The function of the basal ganglia

The basal ganglia, which we first met in Chapter 3, has been around since the tetrapods, but its function has always been a bit of a mystery. One school of thought thinks that the basal ganglia is for

A prehistoric whodunnit!

It's long been argued that one of the major evolutionary developments attributed solely to the Homo genus is the development of tools, the Oldowan tools serving as a prime exhibit. But new excavations

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