Life & Evolution

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E. coli K12 bacterium

LOSS OF APPETITE  Experiments show that helpful gut bacteria like this E. coli K12 produce proteins that could influence the appetite of mice and rats.

Douglas fir trees in Bryce Canyon

Ancestors of  Douglas firs (Pseudotsuga menziesii), such as this one growing in Bryce Canyon National Park, and other conifers underwent genome duplication — adding extra copies of genetic material — around the time of the Permian-Triassic extinction.

pigeon in an experiment setup

Pigeons are more than just annoying “flying rats.” Scientists trained the birds to recognize malignant breast tumors. 

Life & Evolution

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