Harness and steam locomotive: what they have in common

1. Step 1. Harness — is part of — Parachute. Straps that hold a person.
2. Step 2. Parachute — is made of — Silk. The canopy is silk.
3. Step 3. Silk — is material for — Hot air balloon. The Montgolfier balloon was fabric lined with paper.
4. Step 4. Hot air balloon — uses — Convection. Hot air rises and fills the canopy.
5. Step 5. Convection — is used in — Chimney. The draught comes from hot gases rising.
6. Step 6. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.

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