Punched rod hole and particle accelerator: what they have in common

1. Step 1. Punched rod hole — is part of — Index card. It holds the cards in the drawer.
2. Step 2. Index card — is made of — Paper. Paper.
3. Step 3. Paper — is material for — Magnetic tape. Pfleumer’s first tape was paper coated with magnetic powder.
4. Step 4. Magnetic tape — is part of — Tape recorder. Magnetic tape.
5. Step 5. Tape recorder — has part — Electromagnet. Recording heads are electromagnets.
6. Step 6. Electromagnet — is used in — Particle accelerator. Bending magnets.

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