Pliers and r-7 rocket: what they have in common

1. Step 1. Pliers — works like — Blacksmith’s tongs. Blacksmith's tongs and pliers work the same way — two levers on a hinge.
2. Step 2. Blacksmith’s tongs — is used in — Forge. The smith holds the workpiece with tongs.
3. Step 3. Forge — uses — Combustion. Metal is heated in the flame.
4. Step 4. Combustion — uses — Oxygen. It needs oxygen.
5. Step 5. Oxygen — is material for — R-7 rocket. The oxidizer is liquid oxygen.

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