Nitroglycerin and heron’s aeolipile: what they have in common

1. Step 1. Nitroglycerin — is material for — Dynamite. Nitroglycerin in a porous filler.
2. Step 2. Dynamite — evolved from — Gunpowder. A replacement for gunpowder in mining.
3. Step 3. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.
4. Step 4. Rocket — uses — Reaction force. A rocket moves by reaction force.
5. Step 5. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

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