Earth
- Earth
Where rivers run uphill
Three scientists travel to Antarctica to explore a secret world hidden beneath the ice.
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- Environment
Polar ice feels the heat
This is the first of a two-part series on global climate change.
- Earth
Salty, old and, perhaps, a sign of early life
Exploring salt deposits, researchers unearthed the planet's oldest-known, complete molecules thought to have been made by living things.
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- Earth
Arctic melt
There is less ice than ever recorded in the Arctic Ocean, and scientists are concerned.
- Animals
Eyes on the depths
On a recent expedition to the Bahamas, scientists made new discoveries about how deep-sea animals see the world.
- Earth
The Rise of Yellowstone
New evidence points to a recent, rapid rise of land in parts of Yellowstone National Park.
- Environment
Fear Matters
Halloween can scare kids and make them act strange. But animals and ecosystems respond to fear every day of the year.
- Environment
Acid snails
Changing chemistry in the world's oceans could affect the ability of a snail to defend itself.
- Agriculture
Flush-free fertilizer
Scientists have found a new use for human urine — as a potent crop fertilizer.
