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Feb 05, Renee 1, books view quotes. Feb 03, Feb 01, Floyd 96 books view quotes. Jan 14, Jimnaser books view quotes. Go back to the arch. Replace this hinge with a ball and socket, like in your shoulders and hips. Sure, you could stretch out the pelvis, Latimer says, but technologists may already be onto a better solution. Moving the testicles indoors would save men the pain of getting hit in the nuts. Apparently the testicles unlike the ovaries get thrown out in the cold because sperm must be kept at 2. Gallup hypothesizes that these lower temperatures keep sperm relatively inactive until they enter the warm confines of a vagina, at which point they go racing off to fertilize the egg.
So change the algorithm, Gallup says. Keep the sperm at body temperature and make the vagina hotter. Elephants offer a pretty good prototype. Humans typically have three molars on each side of the upper and lower jaws near the back of the mouth. When our brain drastically expanded in size, the jaw grew wider and shorter, leaving no room for the third, farthest back molars. These cusped grinders may have been useful before we learned to cook and process food.
Get rid of them. At one point, they appeared to be on their way out—about 25 percent of people today most commonly Eskimos are born without some or all of their third molars.
So you could call it a wash. Blood flows into each of your arms and legs via one main artery, which enters the limb on the front side of the body, by the biceps or hip flexors. This roundabout plumbing can make for some rather annoying glitches. At the elbow, for instance, an artery branch meets up with the ulnar nerve, which animates your little finger, just under the skin.
Feed a second artery into the back side of each arm and leg, by the shoulder blades or buttock, says Rui Diogo, an assistant professor of anatomy at Howard University, in Washington, DC, who studies the evolution of primate muscles. This extra pipe would provide a more direct route from the shoulder to the back of the hand, preventing vessels and nerves from wandering too close to the skin.
The photoreceptor cells in the retina of the eye are like microphones facing backward, writes Nathan Lents , an associate professor of molecular biology at the City University of New York. The setup may encourage the retina to detach from its supporting tissue—a leading cause of blindness. It also creates a blind spot where cell fibers, akin to microphone cables, converge at the optic nerve—making the brain refill the hole. The recurrent laryngeal nerve RLN plays a vital role in our ability to speak and swallow.
It feeds instructions from the brain to the muscles of the voice box, or larynx, below the vocal cords. Theoretically, the trip should be a quick one. But during fetal development, the RLN gets entwined in a tiny lump of tissue in the neck, which descends to become blood vessels near the heart. That drop causes the nerve to loop around the aorta before traveling back up the larynx.