1, 2, 3, 4, 5... Again about numbers! Don't assume you already know everything about them. A pocket calculator or the most modern computer will not help. The science of numbers would fit, perhaps, in many volumes of large books. That is why we decided to choose the most interesting from magical texts, ancient manuscripts, modern hypotheses about ancient civilizations, whose mathematical knowledge is still considered incredible. This book is for seed reading. There are many interesting riddles and puzzles, counting for the smallest guys. And tests, tables will help improve memory, improve character, find... happiness. Don't believe it? Check!