At the U.N. General Assembly, world leaders queue up to meet with the current U.S. president and discuss the two candidates hoping to replace him. In Europe, an auction house prepares to offer a necklace that might have ties to the French Revolution. Under the sea, a research company hopes to build a station that allows scientists to live and study. And on this date in world history, we cover topics concerning the Constitution, a conquistador, and a historic court appointment!