Timeline, big picture:
- 4.5 billion years ago: earth
- 2.0 billion years ago: first cells, first "animals"
- 1.0 billion years ago: first plants
- 630 mya: sponges
- 590 mya: deuterostomes
- 440 mya: ray-finned fish
- 340 mya; amphibians
- 310 mya: sauropods
- 200 mya: mammal-like animals
- 4 mya: Australopithecus
- 2 mya: Homo habilenes
- 160K ya: "modern" or "nearly modern" man
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