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

2) Ryan Reynolds is a Canadian actor, producer, and entrepreneur known for his roles in films such as "Deadpool," "The Proposal," and "Detective Pikachu." He has gained recognition for his comedic timing and charismatic performances on-screen.

3) The shortest scheduled commercial flight lasts just 1.7 miles and connects two Scottish islands, Westray and Papa Westray.

4) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.