Every Friday at Nothing in Biology Makes Sense! our contributors pass around links to new scientific results, or science-y news, or videos of adorable wildlife, that they’re most likely to bring up while waiting in line for a latte.
From Jeremy: Fundamentalist Christians take issue with set theory? A response
““Unlike the “modern math” theorists, who believe that mathematics is a creation of man and thus arbitrary and relative, A Beka Book teaches that the laws of mathematics are a creation of God and thus absolute…. A Beka Book provides attractive, legible, and workable traditional mathematics texts that are not burdened with modern theories such as set theory.” — ABeka.com
From Sarah: A new species of humans!
“The research adds to a growing body of evidence that runs counter to the popular perception that there was a linear evolution from early primates to modern humans.”
From Noah: The life and times of the Couch’s spadefoot toad in Arizona:
“For a couple of hours the sound of rushing water swallowed everything else. But as soon as that calmed down, a faint bleating like from a herd of sheep lost in the dark could be heard. The mating concert of Couch’s Spadefoots.”
Cross-posted from Denim and Tweed.
It is a widespread misconception that, as we developed the technology to reshape our environment to our preferences, human beings neutralized the power of natural selection. Quite the opposite is true: some of the best-known examples of recent evolutionary change in humans are attributable to technology. People who colonized high-altitude environments were selected for tolerance of low-oxygen conditions in the high Himalayas and Andes; populations that have historically raised cattle for milk evolved the ability to digest milk sugars as adults.
A recent study of population genetics in Native American groups suggests that another example is ripening in the experimental fields just a few blocks away from my office at the University of Minnesota: Corn, or maize, may have exerted natural selection on the human populations that first cultivated it.
The target of this new study is an allele called 230Cys, a variant of a gene involved in transporting cholesterol. 230Cys is known only in Native American populations, and it’s associated with abnormally low production of HDL cholesterol (that’s the “good” kind of cholesterol) and thereby increased risk for obesity, diabetes, and heart disease. In Native American populations, the genetic code near 230Cys shows the reduced diversity associated with a selective sweep, which suggests that, although it’s not particuarly helpful now, this variant may have been favored by selection in the past.
This post is a guest contribution from James Gaines, who lives in Seattle, Washington and holds a Bachelors in Biology from the University of Puget Sound. James writes about natural history at The Glyptodon and is part of a fiction group at now we have to go to the hospital. He’s currently looking into science journalism graduate programs.
If you’d like to write a guest post for Nothing in Biology Makes Sense!, email Jeremy.
“Since music is the only language with the contradictory attributes of being at once intelligible and untranslatable, the musical creator is a being comparable to the gods, and music itself the supreme mystery of the science of man.” –Claude Levi-Strauss (1970)
The Divje Babe bone is old, tens of thousands of years old, a shade less than a foot long and somewhat ugly. Its surface is mottled and rough. It is obviously the fragment of a larger piece – cracks run down its length and the ends have been snapped off. The incompleteness of the thing seems enhanced by two holes in the middle of the bone’s length. But these holes are different. They stare out like eyes, identical in size, perfectly centered, and perfectly artificial. It takes you a moment, but then you see.
It’s a flute – 42,000 years old.
Music is one of the few social constructs that truly permeates human culture, and reasons for this have fascinated scientists and philosophers for centuries. Even Darwin himself wrote on the subject, speculating about whether and how natural selection could explain it. Today, there seem to be three major ideas behind why music evolved. These are not the only ones, but are the most prevalent.