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FEATURE ARTICLE
The process of turning thoughts into speech changes with age
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ALSO IN THE CURRENT ISSUE
Macroscope:
Winners and Losers in the Animal-Research War
Violent attacks on scientists and their families are becoming more frequent
Computing Science:
Wagering with Zeno
A philosopher who did everything by halves may never win, but he won't go broke
Book Review:
Plants as a Force of Nature
A review of The Emerald Planet: How Plants Changed Earth's History, by David Beerling. Beerling tracks major evolutionary events in the plant kingdom through geological time, showing how they have influenced global environmental conditions over the eons
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ONLINE FEATURES
The University of New Brunswick's Earth Impact Database catalogs 174 impact structures around the world
Sociologist Harry Collins ponders expertise and its role in our society
Michael Novacek, curator of paleontology at the American Museum of Natural History, shares his recent reading and favorite authors
Learn the latest science news, and keep up with American Scientist articles and book reviews—free features delivered to your electronic mailbox
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TRIVIA
The icy crust of Jupiter's moon Europa is marked by two types of geological terrain:
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