1) The largest living structure on Earth is the Great Barrier Reef, spanning over 2,300 kilometers (1,400 miles) along the coast of Australia.

2) The Edelweiss flower, found in the European Alps, is known for its beauty and is often associated with mountaineering and alpine culture.

3) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

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