The Universe and Me, Part 7: Humans

Human beings, the anatomically modern kind, have lived on Earth for the last quarter of a million years. Although that is a tiny amount of time compared to the vast spans I’ve described so far, I feel we’ve achieved rather a lot.

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The Universe and Me, Part 6: Mammals

Mammals lived, for 135 million years, in the shadows of much larger reptiles. Dinosaurs dominated the land, giant marine reptiles owned the seas, and pterosaurs patrolled the skies. Mammals did not rest on their laurels, however, developing the traits that define them today. 

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