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Twice a day, at dusk and just before dawn, a faint layer of sodium and other metals begins sinking down through the atmosphere, about 90 miles high above the city of Boulder, Colorado.

As our climate warms, ice melting from glaciers around the world is one of main causes of sea-level rise.

The Permian Basin, located in western Texas and southeastern New Mexico, is the largest oil- and gas-producing region in the U.S.

An analysis of geostationary satellite data found a 10 to 15 percent increase in greening around the rainforest during the dry season.

A team of students working with Jonathan Boreyko, associate professor in mechanical engineering, has discovered the method ducks use to suspend water in their feathers while diving, allowing them to shake it out when surfacing.