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25: 🎂 The Timeline of Timekeeping, Origins of Speech, and the Birthday of Birthdays

Let's Learn Everything!

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Is This a Trick Question?

Researchers used spectrograms to analyze non-human primate calls. They determined the shape of the vocal tract in non-human primates using plastic acid x-rays. And then they use this same methodology to investigate human infant cries, like Tom mentioned, from birth to four days old. Last, they used a cast of fossil skulls, like Caroline said, to determine the vocal anatomy of Neanderthals.

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