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Doing Two Things at Once

It may feel like you’re doing two things at once, but you’re really switching quickly—and every switch takes time. 🎯 First, measure yourself: press whether each number is odd or even. Try eight rounds and you’ll see that each round takes a different amount of time, so we use the average from several rounds. 🔀 Next, mix it up. Add a second rule to the same task so «odd/even» and «size» take turns. Move the mixing handle to 0, 25, 50, or 100 and measure again—at 0, there’s no switching, so the difference disappears. ⏱️ Finally, find where the time went. Compare rounds with «switches» to rounds where you «kept going»: the slowdown comes from switching, not from knowing two rules. That difference is the time it takes to switch once. This app was made with code too · Remix it and measure our class’s results!