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

2) Kim Kardashian West is an American media personality, businesswoman, and socialite. She gained fame through reality television show "Keeping Up with the Kardashians" and has built a successful brand empire encompassing fashion, beauty, and other ventures.

3) The Earth's core is hotter than the surface of the Sun.

4) The development of voice recognition technology has led to the widespread use of virtual assistants such as Siri, Alexa, and Google Assistant.