Programming language and stone tool: what they have in common

1. Step 1. Programming language — evolved from — Ada Lovelace’s program. Lovelace is regarded as the first programmer.
2. Step 2. Ada Lovelace’s program — uses — Babbage’s Analytical Engine. The program was written for the Analytical Engine.
3. Step 3. Babbage’s Analytical Engine — has part — Gear. Gears performed the calculations.
4. Step 4. Gear — is part of — Lawn mower. The wheels turn the blade cylinder through gears.
5. Step 5. Lawn mower — evolved from — Sickle. Mechanized mowing.
6. Step 6. Sickle — evolved from — Stone tool. The first sickles had flint inserts.

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