1) The word "cheese" contains three vowels: E, E, and E.

2) The first commercial GPS (Global Positioning System) was launched in 1989 and provided accurate positioning and navigation capabilities to users worldwide.

3) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

4) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).