What happened 21 years ago?

Why would it have been difficult to carry on scientific investigation in primitive societies or in the Middle Ages? What accent did Betsy Ross have? Why did the French colony had a war with the Iroquois back in 1606? Which value of Greek civilization is reflected in this hymn? How many farmers were killed in Shays' Rebellion? How do you call collect from Poland to US? What is the official government figure of how people died at Tiananmen square? What are accomplishments of the xia Dynasty? What forces in American life contributed to the concept of Manifest Destiny? What were the causes for the Japanese attack on Pearl Harbor? Who built Bastille? Why peasants and surfs were willing to work on a manor? How many rooms does the burj al Arab have? How do astronauts keep their living quarters clean? What inland waterways marked the Southern and Western boundaries of Quebec's new territory? Who plays Charles ii in horrible histories? How has ahimsa influenced people today? During the Great Depression, many families received food from? What were the mining camps like for the men who lived there? What were the routes taken by Ferdinand Magellan?