1) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.

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

3) Leonardo DiCaprio is an acclaimed American actor and environmental activist. He has starred in numerous successful films, including "Titanic," "The Revenant," and "The Wolf of Wall Street," and has been recognized with several awards, including an Academy Award.

4) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.