1) The Great Lakes, consisting of Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario, form the largest group of freshwater lakes on Earth by total area. They are shared by the United States and Canada and are of significant ecological and economic importance.

2) The name "Bluetooth" comes from the 10th-century Danish king, Harald Bluetooth, who united Denmark and Norway.

3) The eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.

4) The shortest war in history lasted only 38 to 45 minutes between Britain and Zanzibar in 1896.