1) Bats are the only mammals capable of sustained flight.

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

3) The Super Bowl is the championship game of the National Football League (NFL) in the United States and is one of the most-watched television events each year.

4) Emma Stone is an American actress known for her roles in films such as "La La Land," "Easy A," and "The Help." She has received critical acclaim and several awards, including an Academy Award, for her performances, establishing herself as a talented and versatile actress.