This week the world has been marking 70 years since the US dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki.
Barack Obama - who won the Nobel peace prize in 2009 for advocating nuclear non-proliferation - and the nuclear deal he oversaw with Iran have put nuclear weapons to the forefront, and Labour leadership front-runner Jeremy Corbyn has pledged to scrap Trident if elected.
This all makes a new visualisation charting every nuclear explosion ever all the more haunting. From Orbital Mechanics, every single detonation (the video counts 2,153) is mapped, from the first US tests, the Hiroshima-Nagasaki bombings, the 1961 Tsara Bomba - the most powerful nuclear weapon ever detonated, to the most recent nuclear explosion when North Korea conducted an underground test in 2009.
Watch it below (red indicates an atmospheric detonation; yellow means underground and blue is underwater).