Did ancient supernovae prompt human ancestors to walk upright?

Supernovae bombarded Earth with cosmic energy starting as many as 8 million years ago, with a peak some 2.6 million years ago, initiating an avalanche of electrons in the lower atmosphere and setting off a chain of events that feasibly ended with bipedal hominins.

from All Top News -- ScienceDaily http://bit.ly/2QuIELD

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