The sound of the largest man-made explosion: A cinematographer films an atomic mushroom cloud on July 19, 1957 in Yucca Flat, Colorado
Business Insider: 7 things the US government says you should never do after a nuclear explosion, from using conditioner to hiding in your car
* In early August, a mysterious nuclear explosion killed at least seven people at a Russian military site.
* Less than two weeks later, the US began testing a cruise missile, stoking fears that the two nations could be headed toward another nuclear arms race.
* In the event of a nuclear explosion on American soil, the US government offers some guidelines for how to seek shelter.
* US government agencies have also warned against certain practices, like eating food that's been left outside or using conditioner in your hair.
A mysterious explosion that killed at least seven people at a Russian military site has reignited concerns about the threat of nuclear warfare.
US officials believe the explosion could be the result of a failed test of a nuclear missile Russia is developing called "Skyfall."
Shortly after the explosion, authorities in the city of Severodvinsk reported a brief spike in the area's radiation levels. Residents of a nearby town were also told to evacuate, but the orders were soon cancelled.
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WNU Editor: 7 things I hope I will never find myself not doing.
