Pallet blocks and zip: what they have in common

1. Step 1. Pallet blocks — is part of — Pallet. Support blocks between which the forklift’s forks pass.
2. Step 2. Pallet — uses — Friction. The load is held on the deck by friction.
3. Step 3. Friction — is used in — Ice skates. Very low friction on ice.
4. Step 4. Ice skates — is made of — Bone. The first skates were horse bones with a polished side.
5. Step 5. Bone — is material for — Button. Ancient buttons were carved from bone and shell.
6. Step 6. Button — works like — Zip. An alternative way of fastening.

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