Guides
Short, clear explainers on coin flips, probability, and making decisions with a bit of chance. Each one links to the SpinPicker tools so you can try the ideas yourself.
Is a Coin Flip Really 50/50? The Surprising Science of the Toss
A hand-flipped coin lands its starting side about 50.8% of the time, so real tosses are nearly but not perfectly 50/50, while a digital flip is exactly fair.
GuideCoin flip probability, explained
A clear, worked guide to coin flip odds, from a single 50/50 toss to streaks, the gambler's fallacy, and the law of large numbers with 100 coins.
GuideHow to Make Random Decisions Without Overthinking
A practical guide to using a coin, wheel, or spinner to settle low-stakes choices fast, plus the gut-reaction trick and when to think it through instead.
GuideHow to call on students randomly without singling anyone out
Randomising who answers removes the suspicion that you have favourites and stops the same four hands doing all the work. Here is how to run it so it lands as fair rather than as a spotlight.
GuideHow to split a class into fair groups
Random assignment stops the friendship groups reforming and stops anyone being picked last. It does not give you balanced groups, and knowing the difference is most of the skill.