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Men's brains shrink faster with age. It still doesn't explain Alzheimer's.
Across 12,638 MRI scans from 4,726 cognitively healthy adults, men's brains lost volume in more regions as they aged than women's did. 1/4
Ravndal et al., PNAS, 2025: doi.org/10.1073/pnas.2510486…
More science: terminal.eli5a.com 3/4
Image: Striatum structural MRI by Lindsay W. Hall and Geoff B. Hall, CC0 (creativecommons.org/publicdo…), via Wikimedia Commons (shown in grayscale, cropped to 4:5 from the original): commons.wikimedia.org/wiki/F… 4/4
A tooth just moved the platypus timeline 12 million years.
Two Early Pleistocene teeth from southwestern New South Wales are the youngest known fossils of the toothed platypus Obdurodon. 1/4
Nink, Worthy & Prideaux, Australian Zoologist, 2026 (accepted manuscript, published online ahead of issue assignment): doi.org/10.1071/AZ26018
More science: terminal.eli5a.com 3/4
Photo: Duck-billed platypus (Ornithorhynchus anatinus), Scottsdale, by Charles J. Sharp, CC BY-SA 4.0 (creativecommons.org/licenses…), via Wikimedia Commons (shown in grayscale, cropped to 4:5 from the original): commons.wikimedia.org/wiki/F… 4/4
The people mosquitoes chose carried less of one skin bacteria genus.
In a study of 37 volunteers, people were split into high-attraction (22) and low-attraction (15) groups by an olfactometer test with Aedes aegypti.
In humans this is an association only. No human repellent effect was tested, the effect was not validated in Anopheles or Culex mosquitoes, and it is not a product.
Gu et al., Nature Communications, 2026. doi.org/10.1038/s41467-026-7…
More science: terminal.eli5a.com
Photo: Aedes aegypti, James Gathany / CDC, public domain, via Wikimedia Commons
What needs a person? Some decisions need an expert, an approval or a careful check before anything happens. Which decision in your work should never run on autopilot, and which one could? Start with the problem: eli5a.com/contact
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A crow can call on cue at 92% accuracy, but the first call after a task switch always runs late. Pecking pays no such cost: deliberate vocal control carries its own executive demand, a first in birds. Proc. R. Soc. B, 2026. 10.1098/rspb.2026.1105 terminal.eli5a.com
What repeats? Every team has work that comes back on a schedule. Which recurring task would you hand to a well-scoped agent first, and where should it stop? Start with the problem: eli5a.com/contact
10 minutes of ultrasound gets the brain's rinse cycle going. In awake mice it boosted the slow waves driving the glymphatic system and improved fluid flow both ways. Mouse work. Science Advances, 2026. 10.1126/sciadv.aeh8870. Education, not medical advice. terminal.eli5a.com
Some decisions should stay with a person. Which ones in your work need an expert, an approval or a careful check before anything happens? That line is where a well-scoped agent stops. Start with the problem: eli5a.com/contact