1) The Treaty of Tordesillas, signed in 1494, divided the newly discovered lands outside of Europe between Spain and Portugal, leading to the colonization of the Americas.

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

3) The Serengeti National Park, located in Tanzania and extending into Kenya, is renowned for its vast savannahs, diverse wildlife, and the annual wildebeest migration. It is a UNESCO World Heritage site and a popular destination for safari enthusiasts and nature lovers.

4) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).