Receive emails about upcoming NOVA programs and related content, as well as featured reporting about current events through a science lens. Mark Siddall: Dear Inge, Yes. Stay very very still. They are ...

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Learn about a 480-million-year-old leech fossil that revealed that ancient leeches didn’t have the biological components necessary to suck blood. It’s the beginning of the spooky season, which means ...

Andrew Plucinski’s leeches are picky about skin. When offered the chance to bite a person who bathes in smelly soap, they recoil, even when they’re hungry. Leeches prefer their humans unseasoned. In ...

MOSCOW — They are small as physician assistants go, about 2 inches long, and slithery. They wiggle about for a bit on Elena A. Kalinicheva’s back before getting down to what they do best: sucking ...

Yelena Titova shakes a jar holding a few dozen leeches writhing in slightly murky water. When one of them sinks to the bottom, motionless, she plunges her hand in and retrieves the late bloodsucker.

Andrew Plucinski’s leeches are picky about skin. When offered the chance to bite a person who bathes in smelly soap they recoil, even when they’re hungry. Leeches prefer their humans unseasoned. In ...

Udelnaya is a sleepy town southeast of Moscow, full of muddy roads lined with brightly painted wooden houses. Behind a frozen stream there is one large brick building that looks a little out of place.

The beagle patrolling Toronto Pearson International Airport was prowling for the subtle scents of contraband when an unexpected odor tickled its olfactory receptors. The source was the luggage of a ...