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Human immune signal sets off bacterial attack
A chemical secreted by immune cells when people are stressed or sick causes a common gut bacterium to go on the offensive against its host.
- Earth
Great river cycles carbon quickly
Some of the organic material carried to the sea by the Amazon is thousands of years old, but much of the carbon in carbon dioxide emanating from the river was stored in plants for less than a decade.
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19579
Your article was very interesting, but it didn’t mention the possibility of a genetic bottleneck after Homo sapiens was already dispersed into Asia and then eliminated from everywhere but Africa by the Toba volcano in Sumatra 74,000 years ago.
