Becoming Human

A paleoanthropologist at the University of Texas in Austin hypothesizes Lucy died 3.2 million years ago  from injuries sustained after falling from a tree. In a paper published in the journal Nature this week, John Kappelman PhD and his team say CT scans of the original fossils indicate fractures consistent with a fall from a great height.

The existence of human ancestors on the island of Flores in the Indonesian archipelago has been pushed back to approximately 700,000 years ago, it was announced in two papers appearing in Nature’s June 9th edition. The formal name of this species uncovered in 2004 is Homo floresiensis.

Broken stalagmites forming two circles within a deep cave in France are reported in the journal Nature this week and dated to 176,000 years ago. Stalagmites are limestone objects on the floors of caves, formed as limestone bearing water drips from the cave ceiling.

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A paper in the journal Nature and commentary in Science shows humans are more energetic, burn more calories and have greater stores of fat than our primate cousins. Read commentary in Science

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Human anatomy and behavior appear to have changed significantly around two million years ago with the emergence of a new hominin species, Homo erectus.  Brains were larger, legs were longer, the ability to range greater distances expanded. What caused these changes?