From a Mastodon post by Rajini Rao (@email@example.com)
When humans migrated across the Bering Strait to N America during the last Ice Age, they brought along domesticated dogs. Soon after, black coats appeared in the native Gray Wolf population, caused by increased melanin due to changes in a single gene.
Known as the K gene (Japanese kurokami for ‘black hair’), the dark coat resulted from a variant introduced by interbreeding with dogs. Wolves carrying one or two copies of the KB version are black.
The frequency of black wolves increases from the Arctic to Mexico. Black coats are more common in regions with canine distemper outbreaks. It turns out that the K gene is a natural antibiotic (“defensin”) that confers immunity against distemper.
But the black coat variant also carries a fitness defect: few pups with 2 copies survive to adulthood. Gray-coated wolves produce larger litters and are more aggressive than black-coated wolves during territorial conflicts.
We studied Mono Lake in my 6th grade class. It’s an interesting ecosystem because the lake doesn’t have any streams taking water away from the lake — it’s a dead end. Over the millennia the lake has gotten very salty, to the point where fish can’t live in it. But there are 2 varieties of algae, and they form the base of a somewhat small food web.
Back in 1913 the city of Los Angeles decided they needed the freshwater that was flowing into Mono Lake and others and built the largest gravity fed aqueduct to bring the water to LA. A lawsuit brought by the Mono Lake Committee managed to save Mono Lake, but not nearby Owens Lake, which dried up entirely. The agreement stipulated that LA would get 1/4 of the water going to the lake, and Mono Lake got the rest.
Now the Committee is trying to get LA to stop taking any water from the lake. We’ll see how this progresses.
You can see the Colorado Plateau on this map. And boy, aren’t our mountains in the east rather meager compared to the Rockies?
You might be surprised, but the lowly zero used to be forbidden.
Sometimes when flying over the middle states, you might see something like this:
Some of the more comedic then say “Look! Crop Circles!” Well, yes, they are crops, and they are in circles, but these aren’t made of aliens. If you got down to the ground to view them close up, you’d see something like this:
So, how does that make the green circles? I’ve wanted to know more, and conveniently Destin at SmarterEveryDay just made this video that explains it really well:
Thanks for explaining all that Destin!
According to this article, bats spend less time hunting for food when the moon is out, supposedly to avoid being eaten themselves.
Spiders are awesome. If you’ve ever seen a dead spider you know that they curl up when they die. They do this because that’s the normal position for the legs; to keep the legs spread out the spider pushes fluid into the legs, which straightens them. Yes, spiders use hydraulics.
So some enterprising engineering people at Rice University decided to use a syringe to actuate this hydraulic system. And she can use it to pick stuff up and put it back down. It turns out that dead spiders can be used as robotic claws. Neat!