1) The Treaty of Versailles, signed in 1919, officially ended World War I and imposed heavy penalties and reparations on Germany.

2) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.

3) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.

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