What We're Following This Evening

Editor’s Note: This article previously appeared in a different format as part of The Atlantic’s Notes section, retired in 2021.

A presidential phone chat: President Obama called Russian President Vladimir Putin after news broke that Moscow would start withdrawing its troops tomorrow from Syria, where Russia has supported the government’s military with airstrikes since last fall. Last month, the U.S. and Russia, who are on opposing sides of the Syrian civil war, agreed on a temporary cease-fire among the multiple groups involved in the conflict.

Another Super Tuesday: Or is it Super Super Tuesday at this point? Voters head to the polls in five states tomorrow: Florida, Illinois, Missouri, Ohio, and North Carolina. Polls show Marco Rubio and John Kasich are at risk of losing their home states, which could quickly turn the race for the nomination into a two-candidate contest between Donald Trump and Ted Cruz. Meanwhile, Hillary Clinton and Bernie Sanders are facing tight races in Missouri, Ohio, and Illinois.

ExoMars, phone home: An unmanned probe launched this morning and bound for Mars pinged humans to let them know it had successfully made it into space. ExoMars, a joint project of the European Space Agency and Roscosmos, will study the Red Planet’s atmosphere. The spacecraft’s Twitter account came to life as soon as it confirmed it was OK:

News from the afternoon here