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

2) The concept of self-driving cars, or autonomous vehicles, is being actively developed by companies such as Tesla, Google (Waymo), and Uber.

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

4) The Victoria Amazonica water lily has leaves that can grow up to 10 feet (3 meters) in diameter, making it one of the largest aquatic plants.