Moments in human history are etched into the Earth. Now researchers are piecing together evidence of our impact on the planet – through the marks we've left on nature.

The world is changing in big ways every day. State of the World from NPR takes you where the news is happening — and explains why it matters. With bureaus spanning the globe, NPR reporters bring ...

Right now, the odds are 1 in 43. UW planetarium guru says El Salvador is much more likely of a hit than Wyoming. Wyoming already had three well-known ticks that are harmful to humans in the state: The ...

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