Feed it a whole number. It will tell you whether the number is one of the stubborn ones, and if not, exactly what it's made of.

Two seeds, one rule. Keep going and the last pair of neighbors agrees on a ratio to six decimals — the garden's favorite number.

Give the bench an ax² + bx + c = 0 and it hands back the roots, the discriminant, and the vertex where the parabola turns around.

Everything falls at the same speed until the air weighs in. Set the drop height (and the gravity — the moon's is 1.62) and let go.

Leave one of the three boxes empty and the bench fills it in.

One point, walking a circle forever.