Bone and air conditioner: what they have in common

1. Step 1. Bone — is material for — Ice skates. The first skates were horse bones with a polished side.
2. Step 2. Ice skates — uses — Friction. Very low friction on ice.
3. Step 3. Friction — is used in — Air brake. Brake shoes slow the wheels through friction.
4. Step 4. Air brake — has part — Compressor. A compressor pumps the air.
5. Step 5. Compressor — is part of — Air conditioner. A compressor.

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