Your brain takes shortcuts all day long. Most are brilliant, but a few fool everyone in predictable ways — try this one on your eyes first.

In this lesson you'll:

• catch your fast answers, and see how one random number can anchor your guesses
• test ideas by trying to prove them wrong, and ask how common something really is
• notice how framing and sunk costs steer your choices
• spot the missing evidence and the streaks that mean nothing, then build your own trap-catching toolkit

About 40 minutes · a phone or laptop, nothing to install. Every step has something to play with: try it honestly, read the short explanation, then press Done to move on.