In the 70 years since Hiroshima and Nagasaki, the "ultimate weapon" has not been used again. But nine nations now have them, and the US and Russia are "modernizing" their massive arsenals. Is "mutually assured destruction" making us safer or more at risk?
Also, President Obama unveils his plan to cut carbon emissions. On today’s Talking Point, in lavish surroundings this weekend, wealthy conservatives auditioned GOP candidates for what they call a "civil rights movement." Some reporters were allowed in — if they agreed to certain conditions.
Photo: A nuclear fireball lights up the night in the United States nuclear test Upshot-Knothole Badger on April 18, 1953. (National Nuclear Security Administration Nevada Site Office Photo Library)