Life & Evolution

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Yersinia pestis bacteria

TINY KILLERS  Acquiring one gene and one mutation allowed these plague bacteria, Yersinia pestis (shown in yellow in a flea’s digestive system in this colored scanning electron micrograph), to cause deadly pandemics. 

A new app compiles millions of records of species worldwide and allows users to add sightings. 

LURE OF LEMURS  Alison Jolly began the first long-term field study of ring-tailed lemurs in 1962. She dedicated much of her later career to conservation efforts, as she details in Thank You, Madagascar.

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