Since WWII, humanity has been able to harness nuclear energy, leading to both power plants and weapons programs, the latter of which caused significant consternation worldwide.
One specific issue nuclear weapons programs caused was for Dr John C Clark, who was put in charge of disarming failed nuclear bombs.
In the 1950s, two nuclear weapons failed to detonate but luckily Clark was able to disarm them with a hacksaw.
Aside from nuclear weapons and nuclear power plants, the atomic age also brought nuclear gardens, where plants were irradiated to interesting effects.