1) The word "piano" contains three vowels: I, A, and O.

2) The world's largest desert is the Antarctic Desert, covering around 5.5 million square miles.

3) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.

4) The world's largest desert is the Sahara Desert in Africa, covering an area of about 3.6 million square miles (9.4 million square kilometers).