In hour one of Here & Now’s April 10, 2018 full broadcast, we discuss the latest on Facebook CEO Mark Zuckerberg’s testimony before Congress with Edmund Lee of Recode. Also, Syrian government forces and their allies are on alert and taking precautionary measures Tuesday, amid fears of a U.S. strike in the wake of an apparent chemical weapons attack. The BBC’s Martin Patience tells us more. And today marks the 20th anniversary of the Good Friday Agreement, which brought an end to decades of sectarian violence in Northern Ireland. Former envoy and U.S. Sen. George Mitchell, who helped broker the deal, reflects on the peace deal’s impact and the challenges that remain today.