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Life on Earth started almost immediately after it cooled, but it took 2bn years - half of Earth's history - before photosynthesis arrived. Shortly afterwards we got multicellular life. Energy from sunlight was the difficult bit.

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Mastodon

This is the Mastodon server used by @h2g2bob. Most posts are public, take a look around. Why not take a look at dbatley.com for other interesting stuff.