31st May, 1596 - René Descartes was born

11st February, 1650 - René Descartes died in Stockholm, Swedish Empire at the age of 53

1720s - Peter the Great admired German and Dutch and their navies so much that Russian language started to have German and Dutch loanwords.

1700s - Russian Royals and upper class used French as their family language to differiate themselves from peasants. Russian upper class didn't change their habit even during Napoleonic Wars.

1800s - Pseudoscientific theory "Social Darwinism" became a thing.

1827 - Robert Brown was looking at pollen grains in water through a microscope and thought why grains are jiggling when there's clearly no movement that causes jiggling. This inspired Einstein to theorize that movement was caused by atomic particles that hit pollen, so pollens starts to jiggle for no reason. This movement is called Brownian motion.

1905 - Einstein mathematically proved the existence of atoms and molecules. Robin Brown thought why pollen grains in water are jiggling under in microscope and Einstein theorized that the movement is caused by atomic particles that hit pollen. He calculated perfectly the movement of pollen grains.

28th June, 1919 - The Threaty of Versailles

30th January, 1933 - Hitler became Reichskanzler

6th August, 1945, 8:15 - US dropped atomic bomb "Little Boy" from "Enola Gay" plane to Hiroshima.

9th August, 1945 - US dropped atomic bomb "Fat Man" from "Bockscar" plane to Nagasaki.

1 March, 1956 - Urho Kekkonen became 8th president of Finland. He was longest serving president of Finland. He was president for 26 years.

13 August 1961 - Berlin Wall was built.