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‘Adam Smith and Margarita Lopez’

Adam Smith and Margarita Lopez

Adam Smith, Ph.D., (left) and then-graduate student Margarita Lopez (an assistant professor at Penn State) open up a sweat-bee nest in the forest surrounding the Barro Colorado Island field station in Panama. The bees dig tunnels into dead sticks suspended in bushes in the tropical-forest understory. (Photo credit: Marcos Guerra, Smithsonian Tropical Research Institute.)

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