1) The word "banana" contains three vowels: A, A, and A.

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

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

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