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Life & Evolution

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giant ground sloths, Megatherium

PREDATOR OR PREY?  Giant ground sloths like Megatherium, illustrated here, were elephant-sized herbivores that, with sharp claws and thick muscle, would have been difficult for prehistoric humans to hunt — though that doesn’t appear to have been a deterrent.

sweet wormwood plant

GREEN MEDICINE  Derived from sweet wormwood plants, the antimalarial compound artemisinin usually composes 0.1 to 1 percent of the dry weight of the leaves. New research more than triples a plant’s yield of artemisinin, to 3.2 percent.

cicadas

Genetic evidence suggests that cicadas on 13- and 17-year schedules can hybridize.  

Life & Evolution

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