Following the success of "The Book of Why" and "The Book of How" comes the third volume full of great answers to tough questions: When do volcanoes erupt? When do wasps sting? When are we sure we are right? When did history begin? When was Santa Claus born? When are we allowed to lie? When do we get a tooth pulled? These and eighty other questions are thoughtfully answered in this well-researched book, perfect for all curious kids.