Tank and electronic calculator: what they have in common

1. Step 1. Tank — has part — Machine gun. The Mark I’s machine guns.
2. Step 2. Machine gun — uses — Reaction force. Recoil energy reloads the weapon.
3. Step 3. Reaction force — is used in — Ion thruster. Jet thrust.
4. Step 4. Ion thruster — has part — Solar panel. Power supply.
5. Step 5. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

Open Evothings