1.Aircraft design 2.Anesthetics 3.Bill Gates 4.Breakfast cereals 5.Earthquakes 6.Easter Island 7.Etiquette 8.Hats 9.Henry Ford 10.False faces 11.Meteors 12.Mother's Day 13.Reptiles 14.Sherlock Holmes 15.Sick Building 16.Tea 17.The internet 18.The New Age 19.The Olympic Games 20.Underwater exploration