How climate drives bird migration

How climate drives bird migration
A strange form of bird migration fails to follow the usual seasonal pattern. How does climate set the pine siskin to flight? More »

Danger: Life without vaccine

Danger: Life without vaccine
Vaccines. Gene-modified food. Climate. We're awash in science skeptics. Is this an anti-science mood, or something more complicated? More »

Stem cell advance

Stem cell advance
Stem-cell therapy is inching ahead. The study did not prove that it works, but other trials are started up. What took so long? More »

Ebola on the march!

Ebola on the march!
It’s “classic dogma”: Bad bacteria and viruses grow less dangerous over time. Not always! More »

Ebola’s end: History’s lessons

Ebola’s end: History’s lessons
As Ebola ravages West Africa, we seek answers in past epidemics. How did cholera, plague, smallpox end? Lacking drugs or a vaccine, how More »

Flying south for the winter?

Flying south for the winter?
A look at long-distance migration reveals surprising pattern. Migration did not originate in the tropics, home of bird diversity. More »