Shovel and heron’s aeolipile: what they have in common

1. Step 1. Shovel — works like — Trowel. A trowel is a mason's small flat shovel.
2. Step 2. Trowel — is made of — Bronze. Ancient trowels were bronze.
3. Step 3. Bronze — is material for — Heron’s aeolipile. The aeolipile is a bronze ball.

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