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Question: What mineral/compound do modern arthropods use for their eyes (vs. Trilobites with their calcite lenses)?
  • Seems to be easier focusing with the calcite as well as durability in the scratchy sand environment.

    Additionally, more derived/later species had aspherical lenses to compensate for the spherical aberration and dual layer organic→calcite lenses to allow for more of a refractive gradient to counteract the double imaging of calcite alone.

    Modern arthropods probably done use it on land because of an inability to accumulate it in an efficient manner. Water arthropods like crustaceans probably done because it's metabolically expensive to do these things when chitin alone can make for useful eyes.

    Evolution is more of a "good enough" kinda situation.

  • Question: What mineral/compound do modern arthropods use for their eyes (vs. Trilobites with their calcite lenses)?
  • From my searching, it would seem that trilobites used calcite to reinforce their hard parts as well. Crustaceans have amorphous calcium carbonate reinforced exoskeletons through mineralization, but no calcite land arthropods do not seem to have this mineralization tho.

    I'm no expert. Just like using Google Scholar to answer questions I find interesting.

  • this rules
  • One of the twilight movies. In a flashback, they show the Volturi massacring a group of vampires in which one of them had converted a child. Being a child when turned made them have no regard for secrecy or discretion, which would have led to them exposing the existence of vampires.

    Which is why they were all coming to kill the Cullens when the mortal Bella gave birth to Edwards half vampire offspring, as another vampire saw a young girl with vampiric powers, not understanding that the half vampire girl would age rapidly until adult and then staying adult for eternity.

    My summary may be slightly off. I read the books like... 16 years ago? Idk.

  • I feel incredibly targeted by this.
  • It's normal when I'm making fucking chili Susan! And there's a difference between too much salt and adding the appropriate amount of salt.

    And research has shown that the most effective way to not have problems with too much sodium in the blood/high blood pressure is to drink more fucking water.

    And the person that complains to me about the salt levels in my food? A) didn't pay for the fucking food and B) drinks 12 fucking diet Dr peppers a day because "they are healthier." So fuck em!

  • I feel incredibly targeted by this.
  • I'm a white dude with no tattoos, but I have this argument all the time with my family. "You can add hot sauce and salt afterward for yourself!" That's not how this works Susan. That's not how any of this works. All of cooking is chemistry and physics! And get over it! If I'm cooking I'm using salt and guajillio peppers!

    Source: Gay and cook food.

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    At time of posting T -6 Minutes.

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    Did He Radicalize You?
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    Photo of JD Vance Wearing Soviet T-Shirt Goes Viral
    www.newsweek.com Photo of JD Vance wearing Soviet T-shirt goes viral

    The Ohio senator has previously faced criticism for his about-turn on Donald Trump, switching from a critic to a staunch supporter.

    Photo of JD Vance wearing Soviet T-shirt goes viral

    Not the best source, but I can't post the image alone.

    Here's the image to save you a click on Newsweek.

    !

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    Gizmo has handlebars.

    My mother's new cat is precious. Wouldn't leave the bed while she was making it.

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    NegativeInf @lemmy.world
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