Continuous glucose monitoring and steam locomotive: what they have in common

1. Step 1. Continuous glucose monitoring — uses — Sticking plaster. The sensor stays on the skin with an adhesive patch.
2. Step 2. Sticking plaster — is part of — First aid kit. Plasters.
3. Step 3. First aid kit — is made of — Tin. A tin box.
4. Step 4. Tin — is material for — Model railway. The first models were tinplate.
5. Step 5. Model railway — works like — Steam locomotive. A model.

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