Nitroglycerin and gyroscope: 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 — evolved into — Guided missile. A rocket with guidance.
5. Step 5. Guided missile — has part — Gyroscope. An inertial system.

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