Social Media News: What Historians Are Talking About This week ... Yohuru Williams, Simon Schama, Rick Perlstein, David Greenberg and more.

Pop Culture Roundup: This Week This week ... NASA, Hitler, Japan, crossword puzzles, and more.

Two, Three... Many Flints by David Rosner and Gerald Markowitz America’s Coast-to-Coast Toxic Crisis

A Jewish candidate won a U.S. presidential primary for the first time by Jonathan Zimmerman And America yawned.

How Margaret Chase Smith stood up to Joseph McCarthy — and won by Ted Widmer When the Republican senator from Maine stood up to Joseph McCarthy in 1950, attacking him for his shameful reliance on "the Four Horsemen of Calumny — Fear, Ignorance, Bigotry, and Smear," it caused a sensation.

Trump’s 19th Century Foreign Policy by Thomas Wright His views aren’t as confused as they seem. In fact, they’re remarkably consistent—and they have a long history.

Ted Cruz Is Not Eligible to Be President by Eric Posner At least according to the most plausible constitutional interpretation.

5 Worst Foreign Policy Moments of GOP New Hampshire Debate by Juan Cole Inevitably with this gang, war, torture and sundry mayhem did make an appearance. Here are the five most cringeworthy moments.

Black Culture and History Matter by Kirsten Mullen It took 150 years after America officially abolished slavery to get a national museum on the black experience.

‘Liberal’? No. ‘Progressive’? Nah. How About ‘Democratic Socialist’? by Leon Fink The democratic socialist tradition that Sanders is invoking may be just what we need.

Why Black History Month should never begin with slavery by Shaun King Harriet Tubman is an important part of black history, but her struggle shouldn't be the starting point for enlightening our children.

Piping as poison: the Flint water crisis and America’s toxic infrastructure by Chris Sellers An estimated three to six million miles of lead pipes across our country still carry water, and most all of them are vulnerable to similar dangers.