Billiard table cushions and payment card: what they have in common

1. Step 1. Billiard table cushions — is part of — Billiards. Rubber cushions bounce the balls back.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — is used in — Accelerometer. The sensor measures the force of inertia.
4. Step 4. Accelerometer — is part of — Smartphone. The accelerometer rotates the screen.
5. Step 5. Smartphone — uses — NFC. Contactless payment.
6. Step 6. NFC — is used in — Payment card. Contactless cards.

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