Sponge and joystick: what they have in common

1. Step 1. Sponge — uses — Capillary action. It absorbs by capillary action.
2. Step 2. Capillary action — is used in — Fountain pen. Ink flows through the nib’s capillaries.
3. Step 3. Fountain pen — is made of — Stainless steel. The nib of a modern fountain pen is stainless steel.
4. Step 4. Stainless steel — is made of — Nickel. Nickel in austenitic steels.
5. Step 5. Nickel — is material for — Potentiometer. The resistance wire is a nickel alloy.
6. Step 6. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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