1) The word "orange" contains three vowels: O, A, and E.

2) The Northern Lights, also known as the Aurora Borealis, are natural light displays that occur in the polar regions due to interactions between the Earth's magnetic field and solar particles.

3) The word "chocolate" contains four vowels: O, O, A, and E.

4) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.