Coho choke on road runoff

Something’s killing Seattle’s coho salmon, and now, scientists know what it is: road runoff. Learn how they figured it out, and what cities can do to help, in my podcast for Scientific American.  

Baking Alaska’s glaciers

Alaska’s glaciers have been disappearing at an alarming rate, producing a torrent of melt water that contributes to sea-level rise. However, scientists are unsure whether most of the ice loss has happened through slow surface melting, or through the dramatic collapse of floating tidewater glaciers like the Columbia Glacier (below). Somewhat surprisingly, a new study … More Baking Alaska’s glaciers

Smoke supercharges twisters

Researchers have found evidence that smoke, for instance, from forest fires, can make tornadoes more frequent and more severe. Hear the full story in my podcast for Scientific American’s 60-Second Science.

Erosion by…lightning?

It sounds crazy, but new scientific evidence suggests it’s true: lightning may play an important role in breaking down mountain tops. To learn more, check out my latest podcast for Scientific American’s 60-Second Science.

When Earth got its water

Believe it or not, scientists still don’t know exactly how or when Earth got its water. Most think water must have come later, delivered by meteors or comets, but a new study suggests it may have been present from our planet’s birth. Find out why in my podcast for Scientific American’s 60 Second Science.