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

2) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

3) 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.

4) Mountains are important water sources, as they capture and store precipitation, feeding rivers and supporting ecosystems downstream.