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In this card activity, students investigate the functions of major digestive organs.

New research suggests humans lived in South America at the same time as now extinct giant sloths, bolstering evidence that people arrived in the Americas earlier than once thought.

Scientists have uncovered new clues about a curious fossil site in Nevada, a graveyard for dozens of giant marine reptiles.

Scientists discovered the oldest known DNA and used it to reveal what life was like 2 million years ago in the northern tip of Greenland.

Earth desperately needs people to stop burning coal, the biggest single source of greenhouse gases, to avoid the most catastrophic impacts of climate change. But it is the world’s biggest source of fuel for electric power and so many depend on it for their very lives.

The US government has pushed more aggressive thinning of stands to reduce vegetation that fuels wildfires.

This activity explores the concepts and research presented in the short film Out of the Ashes: Dawn of the Age of Mammals, which explores how life on Earth recovered after a major asteroid impact.

Floods in northern India were set off by a break on a Himalayan glacier upstream. Here’s a look at how glaciers and glacial lakes form and why they may sometimes break.

We broke phosphorus. And the cost of breaking the phosphorus cycle is not just looming scarcity, but also rampant pollution.

In this Jan. 13, 2021, file photo a wind turbine is silhouetted against the rising sun Wednesday, Jan. 13, 2021, near Spearville, Kan.

America’s rivers are changing color — and people are behind many of the shifts, a new study said.

The world cut its daily carbon dioxide emissions by 17% at the peak of the pandemic shutdown last month, a new study found.