10 Items You Probably Didn’t Know Are Radioactive


Denver, Colorado, despite being a really nice place to live, is actually the home of a ton of cosmic radiation due to the city’s natural height. The population receives twice as much levels of radiation than those who live closer to the sea level in the country.

Exit Signs

The exit signs you see posted around your school or office – yeah, the ones that glow bright red or green – are actually incredibly radioactive. The lighting is an isotope of hydrogen known as tritium, which is made with radiation.