Earth & Environment

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leap second

To add a leap second on June 30, the official time will be 23:59:60 or 11:59:60 p.m.

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.

Kepler-62f

JUMBO-SIZE PLANET  Big rocky super-Earths such as Kepler-62f, shown in this illustration, probably don’t have active plate tectonics, new research suggests. 

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