William H. Calvin
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View article: Using an Emergency Medicine Mindset to Guide Climate Action: Lessons from the COVID
Using an Emergency Medicine Mindset to Guide Climate Action: Lessons from the COVID Open
Earth and Space Science Open Archive posterOpen AccessYou are viewing the latest version by default [v1]Using an Emergency Medicine Mindset to Guide Climate Action: Lessons from the COVIDAuthorsWilliamCalviniDSee all authors William Calvin…
View article: In Rift Valley settings with a feedback loop, assortative mating for versatility predicts hominin brain enlargement in some detail
In Rift Valley settings with a feedback loop, assortative mating for versatility predicts hominin brain enlargement in some detail Open
Hominin procedures for fire-starting, sharpening rocks, and softening roots by pounding or chopping require sustained attention for hours; shade is sought in the brush fringe bordering a grassland. Clustering these more versatile adults, w…
View article: A feedback loop able to enlarge the brain for 2.4 myr without Darwin’s selective survival
A feedback loop able to enlarge the brain for 2.4 myr without Darwin’s selective survival Open
The rapid three-fold enlargement of the hominin brain 1,2 began about 2.3 million years ago (myr) as Africa dried and grass replaced brush, creating great savannas 3 . Seeking an amplifying feedback loop, I analyzed the lightning-brush-fir…