Here is just a part of Tweets related to the visit, war, peace, politics, science, et al (through noon on August 9 (JST)). [All the below are in English.]
Praying for peace in Nagasaki | @nhk_world_news
Nagasaki, 1945: “The world did not need your experiment” | @jricole
Hiroshima wrongly overshadows Nagasaki says @StimsonCenter’s Michael Krepon | @ReThinkDefense
Inspired by Nagasaki’s steadfast commitment to the pursuit of peace. | @CarolineKennedy
“Fat Man” was dropped on Nagasaki on Aug 9, 1945, causing Japan to surrender | @newsflicks
71 years ago today, this was the headline for @nytimes. | @ReThinkDefense
Japan calls for a nuclear weapons free world & for all world leaders to visit | @ReThinkDefense
Obama’s Hiroshima trip stirs debate on Truman’s fateful choice | @ThePartykaGroup
Apology Diplomacy at Hiroshima: my 2010 article in @TheAtlantic | @profLind
Read Harry Truman’s statement on Hiroshima on August 6, 1945 | @Miller_Center
Hiroshima: President Obama and Harry Truman. | @IWF
Truman’s note to Stalin about dropping atomic bomb on Hiroshima #HiroshimaVisit | @Danovate
Why 71 years after Hiroshima every baby born in 2016 contains nuclear radiation | @3tags_org
7 stories from Hiroshima and Nagasaki on the 71st anniversary of the nuclear strike | @TIME
On this day in 1945, the US dropped the Atomic Bomb on Hiroshima. See the aftermath | @LIFE