1) The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of knowledge and played a key role in the Renaissance.

2) The French Revolution, which began in 1789, marked a major turning point in European history, leading to the overthrow of the monarchy and the rise of republicanism.

3) The insurance industry is one of the oldest industries in the world, with roots dating back thousands of years.

4) The universe is estimated to be around 13.8 billion years old.