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“Modern medicine’s ability to keep us alive makes it tempting to think human evolution may have stopped. Better healthcare disrupts a key driving force of evolution by keeping some people alive longer, making them more likely to pass on their genes. But if we look at the rate of our DNA’s evolution, we can see that human evolution hasn’t stopped – it may even be happening faster than before.
Evolution is a gradual change to the DNA of a species over many generations. It can occur by natural selection, when certain traits created by genetic mutations help an organism survive or reproduce. Such mutations are thus more likely to be passed on to the next generation, so they increase in frequency in a population. Gradually, these mutations and their associated traits become more common among the whole group.
By looking at global studies of our DNA, we can see evidence that natural selection has recently made changes and continues to do so. Though modern healthcare frees us from many causes of death, in countries without access to good healthcare, populations are continuing to evolve. Survivors of infectious disease outbreaks drive natural selection by giving their genetic resistance to offspring. Our DNA shows evidence for recent selection for resistance of killer diseases like Lassa fever and malaria. Selection in response to malaria is still ongoing in regions where the disease remains common.”
JJ Editor's Daily Picks
"The results were surprising. The center-right coalition, led by Prime Minister Scott Morrison, remained in power against the opposition Labor party, which had led in every poll for years."
"Anger seldom works against Trump; he owns the currency and can always issue more of it. In addressing the rogue President directly, or speaking about him in the third person, Pelosi usually adopts a tone that is more sorrowful than angry..."
"I am Mizrahi, as are the majority of Jews in Israel today. We are of Middle Eastern and North African descent. Only about 30% of Israeli Jews are Ashkenazi, or the descendants of European Jews."
"Kids are exposed to plenty of controversial social issues on a daily basis. And if parents don’t want their kids to watch “Mr. Ratburn and the Special Someone,” they can turn off the TV."
"Are public-school teachers really underpaid? It’s a claim often made during teacher pay disputes, but the same data and statistical methods that produce the “teacher salary gap” lead to some ridiculous conclusions..."
"Tech companies are getting into the business of making cities. We need to stop Silicon Valley social engineering before things get even worse."
"Having a Library or Cafe Down the Block Could Change Your Life: Living close to public amenities—from parks to grocery stores—increases trust, decreases loneliness, and restores faith in local government."
"“What name . . . shall we give to the darkness of hell...?” The question of how we can name a place such as this is at the center of scholar Scott G. Bruce’s new anthology The Penguin Book of Hell."
"She had all six of her kids — ages 5, 4, 2 (twins) and 10 months (also twins!) in her 10-seater van. To get the kids a quick snack, Curry parked in front of the Cobbler’s Café."
"Nearly three-quarters of those surveyed said they grew up typically eating dinner at a kitchen table, but a little less than half said they do so now when eating at home."
"If you tied a rope tight around the Earth’s equator and then added a single yard of slack, would the extra material make any noticeable difference to someone standing on the ground?"
"While American Jewish women face attacks on our freedom and rising anti-Semitism, abortion opponents are appropriating Jewish history in order to push an agenda that hurts women."