1) In Hindu mythology, the Bhagavad Gita is a sacred text that contains a conversation between Prince Arjuna and the god Krishna, who serves as his charioteer. It delves into philosophical and moral dilemmas and provides guidance on duty, righteousness, and the path to spiritual enlightenment.

2) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.

3) Angelina Jolie is an American actress, filmmaker, and humanitarian. She has received critical acclaim for her performances in films such as "Girl, Interrupted," "Mr. & Mrs. Smith," and "Maleficent," and has been actively involved in humanitarian work around the world.

4) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.