USB and plough: what they have in common

1. Step 1. USB — is used in — USB flash drive. The USB interface.
2. Step 2. USB flash drive — evolved from — Floppy disk. It replaced floppy disks.
3. Step 3. Floppy disk — is made of — Iron. The magnetic layer is iron oxide.
4. Step 4. Iron — is material for — Steel plough. Deere’s plough was made of saw steel in the pre-Bessemer era.
5. Step 5. Steel plough — evolved from — Plough. A steel share.

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