รายละเอียด(อย่างย่อ) Learn how many times the human heart beats in an average lifetime (about 2.5 billion times) and how many breaths we take a day (about 20,000)! Then share these fascinating facts with family and friends to challenge their brains! With more than 100 activities from Sudoku games to fingerprint mazes and chromosome matching—plus over 50 stickers—curious kids will be busy exploring the incredible human body from head to toe in this amazing STEM activity book.