Showing 9 posts tagged evolution
"The human story is really nothing short of the story of a little corner of the universe becoming aware of itself." From National Geographic, paleo-artist John Gurche creates realistic human likenesses of our ancient ancestors. You can see them almost come to life at the Smithsonian’s Hall of Human Origins.
This incredible animation by Flora Lichtman and Sharon Shattuck chronicles the story of British naturalist, anthropologist, biologist, geographer, and intrepid adventurer Alfred Russel Wallace, who was also Charles Darwin's lesser-known partner on the joint presentation On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection. From Smithsonian Mag:
It was during fits of malaria that Wallace started to come up with the idea of natural selection. He sent his manuscript to Darwin, who puts together a set of notes to be presented alongside Wallace’s. When the Linnean Society of London hears the case for natural selection in 1858, Wallace and Darwin share the credit.
So what happened? Why do we remember Darwin and not Wallace? Well, for one, when Darwin published On the Origin of Species, he barely mentions Wallace at all. And Wallace doesn’t complain. In fact, he loves the book. And with that, he fades away.
Though we doubt the story was quite that simple. Read more about the differences of their ideas, see more of Wallace’s Collection (like these) at London’s Natural History Museum, and check out another of his contributions: the Wallace Line.
Related watching: TED Ed’s Five Fingers of Evolution and How Mendel’s pea plants helped us understand genetics, and previously from Lichtman and Shattuck, a favorite: Whale Fall (After Life of a Whale).
via sagan sense.
In this extraordinary adaptation strategy, Thailand’s Moken sea gypsies can see twice as clearly underwater by controlling the size of their pupils. What was generally considered an automatic reflex for the rest of us is now thought to be something that any child under 5 could learn how to do.
From a study called Superior Underwater Vision in a Human Population of Sea Gypsies by Dr. Anna Gislén:
The Moken may learn to do this due to their extensive use of their eyes in water, where accommodation and concurrent pupil constriction is necessary for them to see the items they gather for food. It should then be possible for all humans to learn to see better underwater. But because sea gypsies have lived by and off the sea for thousands of years, evolution may also have favored those who had intrinsically better underwater accommodative powers. The ability to see well underwater could have become a genetic trait. Another possible explanation is that accommodation underwater is a side effect of the diving response; the parasympathetic nerves that control this reflex also control pupil constriction.
From his article in National Geographic:
Most of us will never get to see nature’s greatest marvels in person. We won’t get a glimpse of a colossal squid’s eye, as big as a basketball. The closest we’ll get to a narwhal’s unicornlike tusk is a photograph. But there is one natural wonder that just about all of us can see, simply by stepping outside: dinosaurs using their feathers to fly.