THINKING LIKE A MATHEMATICIAN IS EASY WITH THE SUDOKU CHALLENGE. YOU'LL HAVE LOADS OF FUN WHILE BUILDING AN INSIGHTFUL PERSPECTIVE OF HOW NUMBERS RELATE TO EACH OTHER. EMERGING SCIENCE HAS DEBUNKED THE MYTH THAT INTELLIGENCE IS SET DURING A YOUNG AGE. MEMORY, PATIENCE, COMPREHENSION, AND OTHER COGNITIVE SKILLS CAN BE INCREASED LONG INTO ADULTHOOD. NEVERTHELESS, BEING A LIFELONG LEARNER DOESN'T HAVE TO MEAN LONG HOURS OF STUDYING AND MEMORIZATION. COMPLIES WITH CPSIA. 5 1/2" W X 8 1/2" H