Coining (die stamping) and bicycle: what they have in common

1. Step 1. Coining (die stamping) — is used in — Coin. The image is applied with a blow of a die.
2. Step 2. Coin — is made of — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
3. Step 3. Gold — is material for — Fountain pen. Expensive nibs are gold: it does not corrode and flexes softly.
4. Step 4. Fountain pen — evolved into — Ballpoint pen. A replacement for the fountain pen.
5. Step 5. Ballpoint pen — has part — Ball bearing. A ball in a socket — essentially a ball bearing.
6. Step 6. Ball bearing — is part of — Bicycle. Ball bearings in the hubs and bottom bracket let the wheels and pedals spin easily.

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