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Animal Weapons | Things to Know

VIDEO: How an evolutionary “arms race” leads to flashy horns, pincers and more across the animal kingdom

Five mysteries about breast milk

The little that we know about breastfeeding tells us a lot — imagine if we knew more

Searching for chocolate’s roots, and enemies, in Colombia’s wilderness

A newfound peace has spurred the hunt for disease-resistant wild cacao within the nation’s borders. What scientists find could help the country expand its role in the global trade.

As the Arctic warms, it’s losing more than just ice

SLIDESHOW: Also at risk are the many hidden habitats built into the sea’s frozen wilds.

The marks of extinction

The mass die-offs of Earth’s past may hold clues to our future

The base of the iceberg: It’s big and teeming with life

Passing chunks of ice can fertilize ocean waters and play a role in the planet’s carbon cycle

Sticky science: Evolution of spiderwebs

The eight-legged weavers have been hunting insects for almost 400 million years, flaunting their long history in a rich array of architectures. Scientists are still figuring out the taxonomy of them all.

A treasure hunt for microbes in Chile’s Atacama desert

The famously dry region has long been dismissed as a mostly lifeless wasteland, good for little more than mining of minerals and precious metals. To these researchers, however, it’s a microbial gold mine worthy of protection.

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