Ten surprising ideas a day from maths, science, philosophy, economics, language and the arts. Take a guess, see a plain-language answer, and after ten cards it stops, on purpose.
No streaks. No ads. No tracking. No account. Works fully offline.
Hand-built interactive lessons let you change something and see the result: find the primes by crossing out multiples, flip thousands of coins and watch the average settle, pull the lever in the trolley problem.
Coming soon to the App Store.