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Why C-section births might cause eczema in babies
Here’s a lovely bit of evolutionary trivia: Apparently our hiccups are caused because we’re descended from fish.
Spasms in our diaphragms, hiccups are triggered by electric signals generated in the brain stem. Amphibian brain stems emit similar signals, which control the regular motion of their gills. Our brain stems, inherited from amphibian ancestors, still spurt out odd signals producing hiccups that are, according to Shubin, essentially the same phenomenon as gill breathing.
Love it. Shubin’s book is a nifty and subtle rebuttal to opponents of evolution, since he documents the often kooky ways in which DNA from far-back ancestors wound up inside us: “Fossil amphibian fins that demonstrate a structural affinity with human hands; teeth, first discovered in ancient jawless fish, that evolved into modern mammary and sweat glands; and genes, which control our eyes and ears, that correspond directly to DNA found in primitive jellyfish.” I think I’m going to buy a copy tomorrow.
(Photo courtesy ich_bin_ein_elmo’s Creative Commons Attribution Share-Alike license!)
I'm Clive Thompson, the author of Smarter Than You Think: How Technology is Changing Our Minds for the Better (Penguin Press). You can order the book now at Amazon, Barnes and Noble, Powells, Indiebound, or through your local bookstore! I'm also a contributing writer for the New York Times Magazine and a columnist for Wired magazine. Email is here or ping me via the antiquated form of AOL IM (pomeranian99).
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