1) Orchids are one of the largest families of flowering plants, with over 25,000 species.
2) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.
3) The study of fossils is called paleontology, and it helps us understand the history of life on Earth and the process of evolution.
4) The process of nuclear fusion powers the sun and other stars, fusing hydrogen atoms together to form helium and releasing vast amounts of energy in the process.
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