The conflict over Ukraine is a conflict over international order. That makes it nearly impossible to resolve.
Why are two world powers so intent on controlling Ukraine?
Satellites make it harder for countries to launch surprise attacks. That’s in Ukraine’s favor.
But seeing what’s happening on the ground doesn’t help explain Russia’s motives
The Trump administration is curtailing visas for Chinese scientists. That could backfire.
Excluding foreign researchers and students hurts U.S. innovation — and coronavirus collaboration
Janne Nolan has died. Her scholarship helped shape the debate on U.S. nuclear strategy.
Those lucky enough to work with Janne also will long remember her mentorship.
We tried to save 150 people in Aleppo from 5,000 miles away
[caption id="attachment_52233" align="aligncenter" width="960"] A girl plays amid the rubble
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