Coining (die stamping) and petri dish: 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 — Rapid test. The label is gold nanoparticles.
4. Step 4. Rapid test — uses — Antibodies. Antibodies.
5. Step 5. Antibodies — uses — Germ theory of disease. Immunity against microbes.
6. Step 6. Germ theory of disease — is used in — Petri dish. Growing bacterial cultures.

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