Snowshoes and electronic calculator: what they have in common

1. Step 1. Snowshoes — is made of — Leather. The webbing was woven from rawhide strips.
2. Step 2. Leather — is material for — Drum. The drumhead is stretched hide.
3. Step 3. Drum — works like — Drum machine. An electronic drum.
4. Step 4. Drum machine — has part — Microprocessor. A processor sets the rhythm.
5. Step 5. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.

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