Snowboard and syringe: what they have in common

1. Step 1. Snowboard — evolved from — Surfboard. Surfing on snow.
2. Step 2. Surfboard — uses — Archimedes’ principle. Buoyancy.
3. Step 3. Archimedes’ principle — is used in — Diving bell. Sinking with ballast.
4. Step 4. Diving bell — evolved into — Diving suit. Individual equipment.
5. Step 5. Diving suit — has part — Piston pump. Air was pumped from the surface.
6. Step 6. Piston pump — works like — Syringe. A syringe is a hand-operated piston pump.

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