1) The Renaissance period, which began in Italy in the 14th century, marked a renewed interest in art, literature, science, and philosophy.

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

3) The word "piano" contains three vowels: I, A, and O.

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