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

2) The world's first stock exchange was established in Amsterdam in 1602.

3) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.

4) The Dead Sea, located between Jordan and Israel, is the lowest point on Earth's surface. Its saltwater is so dense that people can easily float on its surface.