Xerography and pneumatic tube: what they have in common

1. Step 1. Xerography — is used in — Photocopier. A photocopy.
2. Step 2. Photocopier — is made of — Carbon. Toner is carbon black in resin.
3. Step 3. Carbon — includes — Diamond. A form of carbon.
4. Step 4. Diamond — is material for — Dental drill. Diamond burs.
5. Step 5. Dental drill — uses — Compressed air. Compressed air.
6. Step 6. Compressed air — is used in — Pneumatic tube. Air pressure.

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