jeffspear.bsky.social

jeffspear.bsky.social

@jeffspear.bsky.social

Postdoctoral scholar, University of Chicago, Tsegai lab | I study mammalian locomotor evolution | I approach my research using integration, biomechanics, and phylogenetic methods.

124 followers153 following98 posts

jeffspear.bsky.social reposted

Can any phylogenetic comparative methods folks help me understand why the Adams & Collyer RRPP method exhibits better statistical power than BM-based permutation methods (e.g. Garland et al. pANOVA)? The permuted approach makes intuitive sense to me and RRPP being better feels like dark magic lol.

jeffspear.bsky.social reposted

Replying to @tetzoo.bsky.social

... (2) most things, even those considered 'well known' are vastly under-tested, even non-tested entirely. There's SO MUCH to do on the data we already have. Part of me thinks I should call this out at every opportunity, flag it as needing attention. But I can't: wordcount is always an issue.

An impressive tour de force on how evolution came to be accepted by the scientific community. We often learn about great discoveries but rarely how consensus gets built. Highly recommend watching if you have... uh... four hours to spare?

Gutsick Gibbon: A Gentle and Modern Ape@gutsickgibbon.bsky.social

Hey guys, if you like science and history check out my new video! I worked hard on it 🥺 youtu.be/SsI7M4NNpEg?...

jeffspear.bsky.social reposted

Replying to @kristalerista.bsky.social

I hope people are doing research on internet video learning and I wish there could be at least half the resources devoted to online video education as to AI in education.

I have three initial thoughts on this: 1) Amazing fossil! Exciting to see our knowledge of apes in Africa expand geographically 2) That is a very questionable use of ASR 3) Come on, Science, seriously no methods whatsoever in the main text!?

This is great. It's not as in depth as the suggestions here, but at my JC in grad school we always asked two questions at the end: "What is the most valuable thing we can take from this paper?" and "What's the next step we would take related to that most valuable thing?" It was fantastic.

Stephen Heard@stephenbheard.bsky.social

It's easier to tear down than build up, and in science we have a bad case of that. So: how to lead a journal club that actually finds value in what you read. scientistseessquirre... 🧪

A great question about the context of Sahelanthropus from @fossilhistory.bsky.social. Figured I'd share it and my best attempt at answering it, rather than letting it linger in replies.

Paige Madison@fossilhistory.bsky.social

...but it matters for how the fossils + findings are interpreted, of course. It’s my understanding that there’s some uncertainty around the fossils’ provenance and dating. If the dates were revised, for example, how might that change your interpretation of the evolutionary significance?

This was one of those exciting papers to write where many of the results genuinely surprised me. I'm proud of the work we did on this one, and huge thanks to Scott for leading and to all my co-authors, as well as the reviewers for important feedback! www.science.org/doi/10.1126/...

science.orgEarliest evidence of hominin bipedalism in Sahelanthropus tchadensisLimb bones of the earliest known hominin, Sahelanthropus, are chimpanzee-like in shape but demonstrate adaptations for bipedalism.

The short version is that geometric morphometric shape analyses link the Sahelanthropus postcranial remains with extant great apes (and especially chimps in the ulna), but we identify some qualitative characters of the femur that strongly imply bipedal locomotion.

Which is in part because he is very, very good at identifying and distilling the most pertinent information and implications, and also because most western journalists at mainstream media outlets don't really seem to understand the war at all.

jeffspear.bsky.social reposted

Professional anatomist here. I label this diagram "Job Security."

Carl Zimmer@carlzimmer.com

Given all the recent buzz about how great ChatGPT has gotten, including its prowess with images, I figured I'd check in on its anatomical skills. Nope.

This kind of simple, robust, hypothesis-driven test of our existing assumptions is so important for our ability to interpret fossils. We need more of it!

Caley Orr@caleyorr.bsky.social

Congrats to our coauthor Joseph Won (PhD Program in Anthropology, CUNY Graduate Center) on his 1st publication. Curvature of the hand & foot proximal phalanges varies between two orangutan species consistent with differences in their substrate use (all trees vs. some ground use). 🧪

jeffspear.bsky.social reposted

Paleo folks: Please recommend researchers (incl yourselves) interested in phylogenetic reconstruction in deep time, molecular clocks (discord w/ fossil clocks), foundational/methodological issues in phylo/paleo-reconstruction & who'd be interested in hanging w/ historians & philosophers of science ⚒️

Curious whether anyone knows if authors of scientific papers are members of this Class, or whether we signed that away to the publishers? Regardless, it's interesting to see which of my papers were used.

Ryan Estrada@ryanestrada.com

Just a reminder to check for your name in this list of books that OpenAI trained from. If your name is there, they probably owe you several thousand dollars. OpenAI cried that if everyone eligible author files, the company will go bankrupt, so I'm alerting every author I have ever spoken to.

jeffspear.bsky.social reposted

Buried in the regime's political takeover letter of the Smithsonian is the worst bit. Unlike exhibits, which are non-destructive towards primary materials, temporary in nature, and reversible, the foundational collections are irreplacable. They want to be able to throw stuff out.

jeffspear.bsky.social reposted

I am no constitutional scholar, but I can't help but feel that "the President gets to dictate what every university can teach and what every television station should broadcast" is closer to what the founding fathers were worried about when it comes to free speech than trigger warnings on syllabi.

jeffspear.bsky.social reposted

One of the marvelous things about the United States - something it shares with Rome, I might add - is that American identity is fundamentally legal in definition and almost totally binary. Regardless of my politics or his, Zohran Mamdani, naturalized in 2018, is every bit as much an American as me.

jeffspear.bsky.social reposted

Musing: one side effect of constantly defending (eg an institution or a political party) against disinformation and bad faith criticism is that you can become habituated to ignoring all criticism (as bad faith), which makes it difficult to learn, adapt, grow, and address your actual weaknesses.

jeffspear.bsky.social reposted

Population wide supplementation as a public health intervention is not new and has yielded incredible health benefits through the years don't let the misguided attacks on fluoridated water fool you. Why do you think iodide is added to table salt? Since we are intent of forgetting history here is a 🧵

jeffspear.bsky.social reposted

“And I’m like, what do you mean, you ‘do your own research’? You running a double-blind study in your living room, dawg?” - A guy walking ahead of me with his friends on a NYC sidewalk in 2021, also my favorite overheard dialogue of the entire pandemic

jeffspear.bsky.social reposted

TLDR: the administration wants to remove habitat loss from the definition of "harm" for endangered species, which will effectively gut the ESA. I just commented. If you're in any way interested in ecology, nature, and the protection of endangered species, you should, too. Free daily action!

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New paper on evolvability in apes, and whether it can help us make sense of the messy evolution of locomotion in that group. My results suggest a feedback effect between integration and the response to selection. We need more research on how integration evolves! link.springer.com/article/10.1...

link.springer.comIntegration, Modularity, and Homoplasy in the Forelimbs of Apes - Evolutionary BiologyCovariation constrains and biases the evolution of morphological traits, leading to similar phenotypes appearing repeatedly in certain clades. Here, I test whether this phenomenon can explain the evol...

We do know it struggles on Windows computers without administrator privileges, but other than that while it's bare bones it's working as intended as far as we know. So curious to send it out into the world and see what people think!

jeffspear.bsky.social reposted

This is how I tend to think about our history, to be honest: the story of American greatness is a story of overcoming the flaws in our republic. And there are periods of retreat and backlash, but in the past, we've always renewed the quest for that more perfect union.

Aaron Rupar@atrupar.com

"I don't want a Disney vacation of our history! I don't a whitewashed history, I don't want a homogenized history. Tell me the wretched truth about America, because that speaks to our greatness" -- 20 hours into his speech, Cory Booker is spitting absolute 🔥

jeffspear.bsky.social reposted

Replying to @bretdevereaux.bsky.social

If you let them do this to immigrants - again *legal* immigrants - you will have *no way* to know when they start doing it to citizens. They'll feed you the exact same lies and refuse to disclose the identities of the people disappeared (as they're doing now).

As JFK famously said, "Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty. Unless they have the gall to say facts to my face. Then f*** 'em."