April 18, 2014 -- Updated 1711 GMT (0111 HKT)
Graham Allison says if an unchecked and emboldened Russia foments conflict in a nation like Latvia, a NATO member with a Russian speaking population, the West would have to defend it.
Ben Wildavsky says we need a better way to determine whether colleges are turning out graduates with superior education and abilities.
John Sutter: Bad news, guys -- the pangolin we adopted is missing.
Jill Koyama says Michael Bloomberg is right to tackle gun violence, but we need to go beyond piecemeal state legislation.
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David R. Wheeler