Who’s smarter: a four-year-old chimp or a four-year-old-human? This is Adam Spencer’s fourth annual publication. It walks us through the numbers 1 to 100, with logic puzzles, challenges and games attached to each number. These interesting and challenging puzzles include Easy-peasy? (playing with tessellations), Fun Fibonacci and Think like a Pirate (Do you get thrown overboard or do you get the money?) amongst hundreds of other fascinating brain-stretchers. Each puzzle has a fun fact alongside it. Did you know that 12 noon was originally at 3 pm?