Who's tougher? Baby sharks or daddy sharks?

It's not just their teeth and jaws that people find intriguing. It's also their funky shapes and unique skeletal makeup that capture attention. Unlike humans and most land animals, sharks have mineralized cartilage skeletons ...

Earthworms—integral ecosystem engineers

Global demands for food and energy are driving research on sustainably using our planet's fast-depleting natural resources. One creative initiative looked to ancient land-use systems that supported millions of people with ...

Life on terra firma began with an invasion

Scientists are now confident animal life on solid ground started with a few short bursts of marine creatures making the leap from the oceans.

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