• Contramuffin@lemmy.world
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    2 months ago

    Wording is funky. To clarify:

    The rain smell is due to a compound called geosmin. The bacteria that produces it is Streptomyces.

    When I taught microbiology lab, I would grow a petri dish of Streptomyces during one particular class and have the students smell it

    • ricecake@sh.itjust.works
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      2 months ago

      It’s worth remembering that evolution doesn’t select for the best as much as it selects against the worst.

      The reason we have such sensitivity doesn’t have to be particularly game changing as long as it doesn’t make us less likely to reproduce.

      You can plainly see our big niche adaptations being used everyday. We think good. We recognize patterns. We use tools. We walk a lot, efficiently and upright. We communicate with high precision. We have a surprisingly efficient digestive system.

      We’re not busting out the ability to smell rain super often, which hints that it might be more in the “doesn’t hurt” category instead of being a big advantage.

      My guess is that being able to smell disturbed soil is helpful for tracking, either where an animal has run or where something has been buried. Our ancestors were not above digging up a fresh-ish dead animal a canine had buried for later.
      But it could just be that rain sense slightly more accurate than looking towards the horizon was as useful then as it is now: vaguely, I guess? It just doesn’t hurt anything.

    • superkret@feddit.org
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      2 months ago

      We evolved in the Savannah.
      Rain means the watering holes are filling up, which is obviously good cause we need water, but it also attracts prey animals.

  • hemko@lemmy.dbzer0.com
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    2 months ago

    Average human male dick length is 2.7cm erect.

    Based on my study with a sample size of 1

  • JimVanDeventer@lemmy.world
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    2 months ago

    I lost my smell to COVID in that first year, before the vaccine. Recently and for the first time since, I smelled petrichor and I could have cried.

  • General_Effort@lemmy.world
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    2 months ago

    Hmm. Seems strangely on point that Ichor is the blood of the (greek) gods. (Petro- means stone, as in Petro-Oleum.)

    Fee-fi-fo-fod

    I smell the blood of a god

  • finitebanjo@lemmy.world
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    2 months ago

    Wish we could be sensitive to H2S, would have saved a lot of lives.

    EDIT: On second thought, no, fuck around pumping fossil fuels and find out.