Sharpen history students' critical-thinking skills with brain-teasing activities. Parents, students, and teachers will love these fun challenges, puzzles, and l

Exercises cover each decade of the 20th century.

Help children of all learning styles and strengths improve their critical thinking skills with these creative, cross-curricular activities. Each engaging activi

Martin Gardner's Mathematical Games columns in Scientific American inspired and entertained several generations of mathematicians and scientists. Gardner in his

This is not really a book. This is a building in the shape of a book...a maze. Each numbered page depicts a room in the maze. Tempted? Test your wits against mi