80 years later

Unexploded WWII bombs are even more dangerous.

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Now, the changing chemistry of unexploded bombs may be making them more dangerous, according to a new study in Royal Society Open Science. The research notes that bombs from the early 20th century were usually made with Amatol, a mix of ammonium nitrate and TNT, and that Amatol grows more volatile when exposed to iron or other metals found in soil. For the research, two bomb specialists in Norway analyzed samples of Amatol from battle sites across Europe, finding that explosives made with the material are “generally much more sensitive to impact than previously assumed.”

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