The size of things in our universe runs all the way from the 10^-19m scale of quark interactions, to the cosmic horizon 10^26m away. In these 45 orders of magnitude, life is confined to just 9 orders of magnitude, in the middle of the universal range: Bacteria and viruses can measure 10^-6m and the height of the largest trees reaches 100m. The honey fungus is 4km across. Known sentient life is 3 orders of magnitude.

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