I hope you get the answers wrong to every puzzle in this book. Don't let me down. I'm being honest. The more questions you answer incorrectly, the more fun you will have . Guardian puzzle master Alex Bellos knows better than anyone that the puzzles we find irresistible are the ones that trip us up. Those that seem blindingly, obviously simple - and yet that we can't help but get wrong. These seventy confounding puzzles - which Alex has scoured from psychology, mathematics, statistics, physics, geography, the science of perception, and more - are guaranteed to catch you off guard. But why are you getting them wrong? And how can you get them right? In Think Twice , Alex delights in tripping us up and then returning us to our feet, explaining how these puzzles work, the biases holding us back - and how to train your brain to avoid being hoodwinked again.

Think once and you will stumble. Think twice and you are in with a chance. Now that you've have been warned, can you prove Alex wrong?.