It's not only nuclear bomb tests that disrupt the atmosphere, there are a number of natural events that can do the same. But how long does any damage last?
The US has 50 nuclear bombs stored in Turkey. As tensions rise between the two countries, a look at how they got there and what might happen next.
Though it causes great personal pain, Hiroshima's last remaining orphans still want the world to hear their stories, 75 years on.
No-deal preparations have been both criticised as being part of 'Project Fear' and used to show that Brexit will be disaster. Here's the history behind this kind of planning.
Approximately 10,000 people have been diagnosed with cancer due to 9/11. What support is available to this community, and is it working?
In what came to be known as the Thule incident, an American bomber crashed in Greenland, spreading radioactive wreckage across 3 square miles of a frozen fjord. Denmark was not happy.