How did zookeepers at an aquarium try to encourage their catsharks to mate? And what causes the butterflies in your stomach when riding roller coasters? This quiz brings together 78 of the best questions and answers from the popular knowledge show "Who Knows That?" Whether alone or with friends and family – with this card game, you can test your knowledge and learn even more. Different topics such as science, the animal kingdom, or everyday life provide variety, and the final master question adds extra excitement.