TNT and aerosol can: what they have in common

1. Step 1. TNT — works like — Dynamite. Two industrial explosives; TNT is safer to handle.
2. Step 2. Dynamite — is used in — Tunnel. Drilling and blasting.
3. Step 3. Tunnel — has part — Street light. Lighting.
4. Step 4. Street light — evolved from — Gas lamp. Gas lamps.
5. Step 5. Gas lamp — has part — Valve. A gas supply valve.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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