Glass bell jars and transformer: what they have in common

1. Step 1. Glass bell jars — is part of — Standard kilogram. Three caps protect against contamination.
2. Step 2. Standard kilogram — is made of — Platinum. A platinum–iridium alloy.
3. Step 3. Platinum — is material for — Cochlear implant. The electrodes are platinum.
4. Step 4. Cochlear implant — uses — Electromagnetic induction. The signal is passed through the skin by induction.
5. Step 5. Electromagnetic induction — is used in — Transformer. Induction between the windings.

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