Card slots and hammer: what they have in common

1. Step 1. Card slots — is part of — Wallet. Card slots.
2. Step 2. Wallet — has part — Zip. A zipped coin compartment.
3. Step 3. Zip — is part of — Trousers. A fastener.
4. Step 4. Trousers — uses — Needle. Trousers were sewn with a needle.
5. Step 5. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.
6. Step 6. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.

Open Evothings