Saddle girth and cannon: what they have in common

1. Step 1. Saddle girth — is part of — Saddle. A girth under the horse’s belly.
2. Step 2. Saddle — evolved into — Stirrup. The stirrup added a foot support to the saddle.
3. Step 3. Stirrup — is made of — Bronze. Early Chinese stirrups were bronze.
4. Step 4. Bronze — is material for — Cannon. The first cannons were cast in bronze.

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