1) Priyanka Chopra Jonas is an Indian actress, singer, and film producer who has made significant contributions to both Bollywood and Hollywood. She gained international fame through her role in the television series "Quantico" and has since starred in successful films.

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

3) The word "country" contains three vowels: O, U, and Y.

4) The world's first car radio was invented in 1929.