1) The assassination of Archduke Franz Ferdinand of Austria in 1914 triggered the start of World War I.

2) The average car has about 30,000 parts.

3) The sitcom "Friends" is known for its iconic Central Perk coffee shop, where the main characters often gather.

4) The coldest known temperature in the universe was achieved in a laboratory in 2019, reaching a fraction of a degree above absolute zero (-273.15 degrees Celsius).