Tibetans high-altitude gene variant spread 3000 years

A high-altitude gene variant spread quickly among Tibetans

≈3,000 years

Over roughly 3,000 years, a gene variant that helps people live at high altitude became very common among Tibetans. It is an example of how quickly natural selection can change a human population when the environment strongly favors a trait.

Rats can learn a pattern and recognize it through another sense

Rats learned a visual pattern such as bright–dim–bright. Later, they recognized the same order when it was presented using completely new sounds. This suggests they learned the pattern itself rather than simply memorizing the original sights.

Cape fynbos has more plant species than the Amazon

3×

Fynbos in South Africa’s Cape Floristic Region is confined to a small area of the Western Cape. It contains more than 9,000 plant species—three times the number found in the Amazon rainforest.

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Tibetans high-altitude gene variant spread 3000 years

A high-altitude gene variant spread quickly among Tibetans

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