Academics

The Languages of Iran

Just by looking at this map of Iran’s spoken languages, you can tell it has a long history of immigrations, migrations, and conquests. Pretty neat!

Chemistry Valentine’s Cards by Nick Uhlig.

So do I! Severed octopus limbs are still active and will try to act as though still attatched!!! they’ll reach for food and try to bring it to the mouth they don’t have anymore!

just woke up from one hell of a nightmare i need a distraction…

Why do cuttlefish have W-shaped pupils? What purpose does that particular shape serve?

Good question! The cuttlefish’s distinctive W-shaped pupil and “eyelid” helps even out the scattered light of the reef and reveal hidden prey.

Is it possible to be involved with the anthropology "community" despite not having a degree in anthro?

I don’t see why not. I think we encourage interdisciplinary work. 

creativelibra: Is the feeling of love really just a chemical reaction in your head?

How 250 Siberians Became the First Native Americans

The Americas are a big place, but the Native American group that first settled it was small — just about 250 people, according to a new genetic study.

These people, known as a founding group because they “founded” the first population, migrated from Siberia to the Americas by about 15,000 years ago, said study co-lead researcher Nelson Fagundes, a professor in the Department of Genetics at Federal University of Rio Grande do Sul, in Brazil.

Figuring out the size of founding groups is key, because it determines the amount of genetic diversity that gets passed on to the group’s descendants, Fagundes said.

That, in turn, could alter how effectively natural selection weeds out bad genes, Fagundes said.

“Large populations have very efficient selection, while in small populations, mildly deleterious alleles [versions of genes] can spread, which may increase genetic susceptibility to some diseases,” Read more.

In 1941, Swiss engineer George de Mestral noticed after a hunting trip that burrs from burdock plants stuck to his pants and his dog’s fur. 

He took the seed and looked at them through a microscope to find that this seed attaches to animal fur via the hooks on its surface to improve distribution.

                               Source: All of Nature on Blogspot

These hooks would latch onto anything loop-shaped, such as the fibers in his pants and his dog’s tangled fur. This inspired him to come up with the ‘Velcro’.

Velcro is a bio-mimicry of this burrs with small flexible hooks attached on its surface to attach to fluffy surfaces.

Although it goes by the name Velcro the generic name is a  hook-and-loop fastener)  

And depending on the load that needs to be held there are different types of hooks that are available:

The sound that the velcro makes when you rip it apart is oddly satisfying. It is made when the loops are ripped apart from the hooks.

It was always in my head that the hooks or the loops would break whenever you would rip it apart. But turns out, they are extremely flexible.

                                                Source

For a long time I believed that this was the end of the story and that’s how far we had gone. But recently when I was trying to mount a board to the wall, I came across the 3M dual lock fasteners.

These use a mushroom shaped hook on both the sides to snap together in place.

                                                  Source

And evidently it turns out the mushroom fastener design were inspired from dragonflies who used it for stability during mating (check source video above for more).

This is great, but since this is made of plastic this surely would fail at higher temperatures. You need something robust to handle higher temperatures, and this is where the Metaklett comes into the picture:

A square metre of this fastener, called Metaklett (made of steel), is capable of supporting 35 tonnes at temperatures up to 800 ºC,  (Video)

There is something exotic in the blend of nature and technology that is manifested in the Velcro, I just cannot put my hand on what it is.

Have a great day!

What is America’s obsession with Bill Nye the Science Guy I once said in class that I had never seen it and this girl yelled YOU’VE NEVER WATCHED BILL NYE and in 5 seconds flat half the class was screaming HOW COULD YOU HAVE NEVER WATCHED BILL NYE while the other half chanted BILL BILL BILL BILL

this is so rare!!! and it’s not albino, because its eyes are the usual color instead of pinkish- it’s the same gene that gives some moose white spots!

Nature spirit.