Sisal fiber board and hammer: what they have in common

1. Step 1. Sisal fiber board — is part of — Darts. Compressed fibre that holds the darts.
2. Step 2. Darts — evolved from — Bow and arrow. Accuracy of shooting.
3. Step 3. Bow and arrow — is made of — Flint. Arrowheads were knapped from flint.
4. Step 4. Flint — is material for — Stone tool. Tools were knapped from flint and other rocks with a sharp fracture.
5. Step 5. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.

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