Jodi Guyot

Early humans had jaws of steel

You shouldn't use your teeth to open a beer bottle or crack a nut--you'd break a tooth or even your jaw. But our earliest ancestors could have done it. Super-strong jaws in our 2.5-million-year-old relatives helped them adapt to changes in food sources in their environment. --by Jodi Guyot

Researchers find earliest evidence for modern human behavior

Scientists have discovered shellfish remains, tiny stone blades and red ochre pigments in a cave in South Africa. The 164,000-year-old artifacts suggest that early humans were using tools, engaging in symbolic behavior, and even eating seafood much earlier than previously thought. --by Jodi Guyot

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