The Football War (Spanish: La guerra del fútbol; colloquial: Soccer War) also known as the Hundred Hours' War or 100 Hour War, was a brief military conflict fought between El Salvador and Honduras in 1969. Existing tensions between the two countries coincided with rioting during a 1970 FIFA World Cup qualifier. The war began on 14 July 1969 when the Salvadoran military launched an attack against Honduras. The Organization of American States (OAS) negotiated a cease-fire on the night of 18 July (hence "100 Hour War"), which took full effect on 20 July. Salvadoran troops were withdrawn in early August.
Considering how insane football ultras and hooligans can be, I'm surprised there hasn't been a second Football War yet
"Cleanrooms typically come with a cleanliness level quantified by the number of particles per cubic meter at a predetermined molecule measure. The ambient outdoor air in a typical urban area contains 35,000,000 particles for each cubic meter in the size range 0.5 μm and bigger, equivalent to an ISO 9 certified cleanroom. By comparison an ISO 14644-1 level 1 certified cleanroom permits no particles in that size range, and just 12 particles for each cubic meter of 0.3 μm and smaller. Semiconductor facilities often get by with level 7, while level 1 facilities are exceedingly rare."
