Hook point and newcomen engine: what they have in common

1. Step 1. Hook point — is part of — Fish hook. A sharp end that enters the fish’s lip.
2. Step 2. Fish hook — is made of — Bone. Ancient hooks were carved from shell and bone.
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 — has part — Piston. A plunger.
6. Step 6. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.

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