Rain gauge and bicycle: what they have in common

1. Step 1. Rain gauge — is made of — Bronze. Korean rain gauges (1441) are bronze.
2. Step 2. Bronze — is material for — Stirrup. Early Chinese stirrups were bronze.
3. Step 3. Stirrup — evolved from — Saddle. The stirrup added a foot support to the saddle.
4. Step 4. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.

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