On this day in 1981, more than 100 workers were exposed to radiation during repairs of a nuclear power plant in Tsuruga, Japan.
On this day in 1983, American schoolgirl Samantha Smith was invited to visit the Soviet Union by its leader Yuri Andropov after he read her letter in which she expressed fears about nuclear war.
On this day in 2005, Bulgaria and Romania signed accession treaties to join the European Union.
On this day in 2015, nearly 9,100 were killed after a massive 7.8 magnitude earthquake strikes Nepal.