Fish hook and shipping container: what they have in common

1. Step 1. Fish hook — is made of — Bone. Ancient hooks were carved from shell and bone.
2. Step 2. Bone — is material for — Harpoon. The oldest harpoons (Katanda, ~90,000 years ago) are carved from bone.
3. Step 3. Harpoon — has part — Rope. A line connects the head to the hunter.
4. Step 4. Rope — evolved into — Wire rope. A steel counterpart of rope.
5. Step 5. Wire rope — is part of — Container crane. Cables.
6. Step 6. Container crane — uses — Shipping container. It moves containers.

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