I Think Nate's the Schmidt

CLADISTICS ruined my life

yall joke but this is actually a serious conundrun with cladistic-based classification

The choice is this: 

Birds are reptiles 

Or crocodilians (and probably turtles) ARENT 

That’s it, that’s the choice 

What if Bird and reptiles are two different things that came from the same thing

Nope 

Because you can’t group (lizards, snakes, tuatara, turtles, crocodilians) without also including (birds) 

So if you don’t want to include birds in reptiles then you have to leave out some things we’ve called reptiles 

birds are dinosaurs though, full stop. we’ve already defined what a dinosaur is and it includes birds. but reptiles isn’t really defined so much as thrown against a wall angrily. 

But don’t turtles and alligators have more in common with modern reptiles than modern birds have in common with modern reptiles? I’m not trying to contradict, I’m trying to understand. Mammals and reptiles have a common ancestor as well, but we do not make them the same group.

It’s not about having things in common. It’s about common ancestry, which is how we classify animals in light of extinct species, which defy trait-based classification. 

And, the common ancestor of [lizards, snakes, tuatara, turtles, crocodilians] by definition is also the common ancestor of birds. It is NOT the common ancestor of mammals. 

So, either we decide that Tuatara Lizards and Snakes are the only reptiles, or we include birds as reptiles. Or we just decide reptiles are no longer a thing. 

don’t throw reptiles against the wall? please? some of them are small and delicate. you could hurt them.

Basically, unless we’re maybe talking massive horizontal gene transfer, everything is still part of the group that came before it. 

You are technically a fish.

IIRC the fish thing is so frustrating that scientists have decided fish is just not real cladistic grouping at all

hey could we go back please to the bit where the closest relative of Birds is Crocodiles? bc I am alarmed

Well, technically they’re equally-closely related to crocodiles, alligators, gharials and tomistomas. As archosaurs, they’re all descended from small reptiles that looked something like this 

The two main groups of archosaurs are the Pseudosuchia, or crocodile-line archosaurs, and the Ornithodira, or bird-line archosaurs. Both groups were massively diverse in prehistory, with the Pseudosuchia dominating most land-based niches in the Triassic, and the Ornithodira, especially the dinosaurs, doing the same during the Jurassic and Cretaceous. However, most of them have been wiped out due to the Triassic and Cretaceous mass extinctions, leaving them each with only one surviving clade: Aves, the true birds, and Crocodylia, the semiaquatic, ambush predators like crocs and gators. 

This entire post sums up everything we’re not allowed to mention in our Vertebrata classes because the last time someone started that argument they had to break up a fistfight.

I’m just hung up on the humans evolving from fish comment.

Like, we evolved from tiny tree-climbing squirrels. To the best of our knowledge.

…which evolved from tiny tree-climbing reptiles

…which evolved from amphibians

…which evolved from fish.

*runs in ten minutes late with a plucked chicken* BEHOLD A LIZARD

When I was a child, my father would take me trout fishing, and I spent hours marveling from the riverbank at the trouts’ ability to, seemingly effortlessly, hold their position in the fast-moving water. As it turns out, those trout really were swimming effortlessly, in a manner demonstrated above. The fish you see here swimming behind the obstacle is dead. There’s nothing powering it, except the energy its flexible body can extract from the flow around it. 

The obstacle sheds a wake of alternating vortices into the flow, and when the fish is properly positioned in that wake, the vortices themselves flex the fish’s body such that its head and its tail point in different directions. Under just the right conditions, there’s actually a resonance between the vortices and the fish’s body that generates enough thrust to overcome the fish’s drag. This means the fish can actually swim upstream without expending any energy of its own! The researchers came across this entirely by accident, and one of the questions that remains is how the trout is able to sense its surroundings well enough to intentionally take advantage of the effect. (Image and research credit: D. Beal et al.; via PhysicsBuzz; submitted by Kam-Yung Soh)

Oh my god what the fuck

Researchers at King’s College London found that the drug Tideglusib stimulates the stem cells contained in the pulp of teeth so that they generate new dentine – the mineralised material under the enamel.

Teeth already have the capability of regenerating dentine if the pulp inside the tooth becomes exposed through a trauma or infection, but can only naturally make a very thin layer, and not enough to fill the deep cavities caused by tooth decay.

But Tideglusib switches off an enzyme called GSK-3 which prevents dentine from carrying on forming.

Scientists showed it is possible to soak a small biodegradable sponge with the drug and insert it into a cavity, where it triggers the growth of dentine and repairs the damage within six weeks.

The tiny sponges are made out of collagen so they melt away over time, leaving only the repaired tooth.

That is by far the coolest thing I’ve heard this year.

‘Okay so guys we’re still working on that whole alzheimer’s thing, but along the way we kind of accidentally regrew everybody’s teeth.’

Continue Reading.

Science!

@bloodthreadsaltglassandtears your time has come

i have already registered an account and begun looking at penguins

#the title reads like a joke article#but this is a genuine science emergency!

Do the right thing guys!

@diamondauthorityofficial for science! 🙌

LOOK AT ME I AM DOING A SCIENCE!

SEE LOOK HERE IS A PENGUINS (d’awwwww such cute birbs) AND I COUNTED THEM

seriously tho this is a lot more fun than I thought it would be and I got really sad when I reached the end of the current batch of photos, only to see that I’d actually done 113 of them! it really didn’t feel like that many 

GO DO A SCIENCE TOO! and there’s also one to help study the behavior of Arizona bats!!!

@rosethornpixie found your new job