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

2) The invention of the transistor by Bell Laboratories in 1947 revolutionized electronics and paved the way for the development of smaller, more efficient electronic devices.

3) The word "yesterday" contains three vowels: E, A, and A.

4) The first bank in the world, Banca Monte dei Paschi di Siena, was established in Italy in 1472 and is still in operation today.