Around 1268, Roger Bacon wrote that which optical devices could be used to help people with weak eyesight?

Around 1240, which Mongol conqueror's grandson Batu founded the Golden Horde? According to the Bible, after Moses died, which leader led the Israelites in the conquest of Canaan? Around 1250, which country's King Afonso III reclaimed the Algarve from the Moors? Around 1260, which country acquired Greenland and Iceland under King Haakon IV? Which pharaoh became king of Egypt as a child around 1332 B.C. and is famous for the treasures of his tomb? The Dead Sea, whose shores are the lowest land on Earth's surface, is on which continent? In the 14th century, Adrianople became the capital of which empire, until Constantinople replaced it in 1453? Around 1400, Gian Galeazzo Visconti ruled much of northern Italy from which city, until he was blocked by the Florentin…