1) The first modern health insurance policy was introduced in Germany in the late 19th century.

2) The Tour de France, first held in 1903, is one of the most prestigious and grueling cycling races, covering over 3,500 kilometers (2,200 miles) in three weeks.

3) The concept of federalism involves the division of powers between a central government and regional or local governments, allowing for shared governance and autonomy for different levels of administration.

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