Top 10 20th century facts

Bank robbery. Before the Russian Revolution, Communist paramilitaries were often raising money through robberies and ransom kidnappings. Particularly notable was the 1907 Tiflis bank robbery, in which Stalin participated (playing minor role). The robbery resulted in 40 deaths and the theft of 341,000 rubles (equivalent to around US $3.4 million today).

Women were allowed to participate in athletic competitions. The decision to include women in athletic competitions was widely criticised not only by the majority of the sport community, but also by Vatican.

Holy Bible. Radio intelligence played a major role in the Polish-Soviet war. Poles actively searched for radio frequencies used by Red Army just to disrupted by broadcasting Bible verses, so the Soviets were unsure if this is an accidental disruption by local radio station or not.

Anti-fascist Protection Rampart. The name implied that West Germany had not been fully de-Nazified. Before the Wall's erection, 3.5 million East Germans defected from the GDR. Between 1961 and 1989, the wall prevented almost all such emigration.

Japan. Poland declared war on Japan on 20th December 194 as most of WW2 allies. Though Empire of Japan refused to accept a state of war due to friendly relations between the two countries. Despite that legally the state of war lasted until 8th February 1957. It might be the longest war without any clash.

Volcano eruption. The city was covered with pyroclastic flow, consisting of superheated steam and volcanic gases, with temperatures exceeding 1,075 °C (1,967 °F). One of the survivors was held in an underground cell in the town's jail.

Romania. Ceaușescu’s regime collapsed after he ordered his security forces to fire on antigovernment demonstrators in the city of Timișoara on December 17, 1989. The demonstrations spread to Bucharest. Ceaușescu fled the capital in a helicopter but was captured by the armed forces. Three days later he got executed after a brief trial.

New York City organised crime families. Those are the names of 3 out of 5 major New York City organized crime families called "The Five Families". The term was first used in 1931, when Salvatore Maranzano formally organized the previously warring gangs into what are now known as the Bonanno, Colombo, Gambino, Genovese, and Lucchese crime families.

Around 600. Polish Armed Forces did have around 600 tanks at its disposal. Mainly tankettes TK-3 and TKS but also 7TP, Renault FT, Renault R-35, Hotchkiss H-35 and couple of prototypes.

Japan. The Russo–Japanese War was fought over rival imperial ambitions in Manchuria and Korea. The major theatres of operations were the Liaodong Peninsula and Mukden in Southern Manchuria and the seas around Korea, Japan and the Yellow Sea.