Bananas Produce Nuclear Radiation
Bananas are naturally radioactive due to their high potassium content, specifically the isotope potassium-40, which undergoes beta decay. Eating a banana exposes you to about 0.1 microsieverts of radiation, comparable to a short airplane flight but harmless. This 'banana equivalent dose' is used by scientists to contextualize low-level radiation risks.
💡 Fun detail:
A truckload of bananas could theoretically trigger a radiation detector at a port, leading to real-life customs alerts mistaken for smuggling. You'd need to eat 10 million bananas in one sitting to receive a medically significant dose.
Source: American Nuclear Society