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suggesting the universe will expand indefinitely, and as the stars burn out, it will end in a whimper rather than a bang.

When studying the forces of economics, natural experiments arise through changes in policy — for example, lowering the minimum wage in one state but not another.

When it comes to America's use of energy, how much do we get from where? And what is the future of our complex grids?

The October 2015 leak at the Aliso Canyon plant in Los Angeles, which displaced 8,000 families, shows that U.S. gas storage infrastructure is old and requires improvement, say federal officials.

U.S. Poet Laureate Ada Limón has announced her signature project titled " You Are Here," which hopes to engage people with poetry and nature.

Energy prices are going up — for things like coal, natural gas and crude oil. On Tuesday, global crude oil prices topped $80 a barrel for the first time in nearly three years.

The Obama administration is kicking off a campaign to encourage legal immigrants in the country to become citizens, which could potentially swell voter rolls by millions before Election Day.

A humble farmer from a marginalized tribal community takes on a solo mission to reforest an island in Assam, India.

Camps in nature can be great for kids, but they can also expose campers to floods, wildfires and heat. Here are the top questions experts say people should ask camps about safety.

Some of the country's last beaches spared from development are now carpeted in globs of tar from an oil spill in the Mediterranean, damaging beaches that are nesting grounds for endangered turtles.