Rubber eraser block and turbojet engine: what they have in common

1. Step 1. Rubber eraser block — is part of — Eraser. Rubber or PVC with an abrasive.
2. Step 2. Eraser — is used in — Pencil. Erasing.
3. Step 3. Pencil — is made of — Graphite. The lead is graphite mixed with clay.
4. Step 4. Graphite — is material for — Ion thruster. The grids are graphite or molybdenum.
5. Step 5. Ion thruster — uses — Reaction force. Jet thrust.
6. Step 6. Reaction force — is used in — Turbojet engine. Thrust is the reaction of the jet.

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