Pippi Longstocking Learns About Sharks is a children's book written by Astrid Lindgren. The book is about Pippi who decides to learn everything about sharks. She visits the aquarium with her friends Tommy and Annika, but when they close for the night, Pippi decides to swim with the sharks. The book is an exciting and educational story that teaches children about life under the water and how important it is to be brave and curious about new things.