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DorsaAmir's profile
Dorsa Amir
Dorsa Amir
Dorsa Amir
@DorsaAmir

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Dorsa Amir

@DorsaAmir

Evolutionary anthropologist studying how culture shapes the mind. Postdoc @BerkeleyPsych. Iranian-American. Mom. Some people just want to watch the world learn.

California, USA
dorsaamir.com
Joined July 2012

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    Dorsa Amir‏ @DorsaAmir 15 Jan 2019

    Did you know the human body is full of evolutionary leftovers that no longer serve a purpose? These are called vestigial structures and they’re fascinating. (1/8)

    9:29 AM - 15 Jan 2019
    • 30,905 Retweets
    • 72,122 Likes
    • pf.jenkins John Grönvall Scott Phillips Anna Lechoslavovna 🌹🏳️‍🌈🇵🇱 REOAGILE 😇 🖍👩‍🎨 Netta Steinberg Andrew Younger Robert 🌈🖖🖖
    726 replies 30,905 retweets 72,122 likes
      1. New conversation
      2. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        Put your hand flat on a surface and touch your pinky to your thumb. Do you see a raised band in your wrist? That there’s a vestigial muscle called the palmaris longus. It used to help you move around the trees. About 14% of us don't even have this muscle anymore. (2/8)pic.twitter.com/ZF3Ta91IGy

        395 replies 2,625 retweets 13,610 likes
        Show this thread
      3. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        Check out your ear. Do you see this little bump? That’s called Darwin’s tubercle. It used to help you move your ears around. Now that we have super-flexible necks, we don’t need these anymore. (3/8)pic.twitter.com/2OlVWEu6gT

        123 replies 1,112 retweets 7,977 likes
        Show this thread
      4. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        Here’s a more obvious one: the tailbone. This is the ghostly remainder of our lost tails, which were useful for balance & movement in trees. We still grow tails as embryos, but then attack and destroy them in the following weeks. Not the most efficient system. (4/8)pic.twitter.com/pmF2lCpnyT

        84 replies 963 retweets 7,605 likes
        Show this thread
      5. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        Ever wonder what this little pink thing in your eye is? This is the plica semilunaris. It used to be a third eyelid that would blink horizontally. You can see this in action in the eyes of many other animals. (5/8)pic.twitter.com/0ubMulahA0

        91 replies 1,756 retweets 10,852 likes
        Show this thread
      6. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        Oh, and you know how you sometimes get goosebumps when you’re cold or scared? That’s a vestigial reflex that used to raise body hair to make you appear bigger or trap an extra layer of heat for warmth. Some people can actually do this on purpose. (6/8)pic.twitter.com/uY2zJddguy

        100 replies 1,178 retweets 10,284 likes
        Show this thread
      7. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        Another cool reflex is the palmar grasp reflex. If you place your finger on an infant’s palm (or feet!), they will try to grasp it. Ancestral primate babies would have used this to grasp on to their parents for transport. (7/8)pic.twitter.com/LFpN1ykSug

        63 replies 1,143 retweets 9,821 likes
        Show this thread
      8. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        These are just a few pieces of evolutionary baggage handed down to you from your primate ancestors, among others. Your body is basically a natural history museum! (8/8)

        60 replies 690 retweets 9,058 likes
        Show this thread
      9. Dorsa Amir‏ @DorsaAmir 15 Jan 2019

        A few addendums: Wisdom teeth — yes, though still ~functional for original purpose. Appendix — potentially yes, though it still seems to do stuff (may have been repurposed). Male nipples — though technically non-functional, not quite vestigial. Due to embryonic development.

        175 replies 500 retweets 5,632 likes
        Show this thread
      10. Dorsa Amir‏ @DorsaAmir 16 Jan 2019

        Additional footnote: I think the diagram I randomly pulled off Google Images yesterday isn't as precise as it should be. *This* is the plica semilunaris.pic.twitter.com/nWh4PLoiOV

        91 replies 312 retweets 3,685 likes
        Show this thread
      11. End of conversation
      1. New conversation
      2. Alex Dumortier‏ @LIBORsquared 15 Jan 2019
        Replying to @DorsaAmir @Jesse_Livermore

        Don't forget our dewclaws:pic.twitter.com/n1qu3zXLaJ

        27 replies 21 retweets 624 likes
      3. andreas‏ @andreas_omh 15 Jan 2019
        Replying to @LIBORsquared @DorsaAmir @Jesse_Livermore

        I don't have those

        17 replies 38 retweets 2,632 likes
      4. Show replies

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