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Said and published

• John Baez Mastodon 13 Sept 𝐅𝐄𝐑𝐍 𝐒𝐏𝐈𝐊𝐄𝐒 We know there was an asteroid impact around when the dinosaurs went extinct 65 million years ago, because we see a rare metal called iridium in the strata from this time - and droplets formed by…