Skate blade and piston pump: what they have in common

1. Step 1. Skate blade — is part of — Ice skates. A steel blade.
2. Step 2. Ice skates — is made of — Bone. The first skates were horse bones with a polished side.
3. Step 3. Bone — is material for — Needle. The first needles with an eye were carved from bone.
4. Step 4. Needle — is part of — Syringe. A hollow needle.
5. Step 5. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.

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