Electric unicycle and chisel: what they have in common

1. Step 1. Electric unicycle — uses — Gyroscope. Gyro sensors feel the lean, and the wheel rolls to keep the rider up.
2. Step 2. Gyroscope — is part of — Torpedo. Obry’s gyroscope keeps the course.
3. Step 3. Torpedo — uses — Compressed air. The first torpedoes ran on compressed air.
4. Step 4. Compressed air — is used in — Rock drill. Pneumatics.
5. Step 5. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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