Chlorine and aeroplane: what they have in common

1. Step 1. Chlorine — is material for — Bleach. Hypochlorite.
2. Step 2. Bleach — is material for — Paper. Bleach makes paper white: without it wood pulp would be yellowish grey.
3. Step 3. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
4. Step 4. Hot air balloon — evolved into — Airship. A steerable balloon.
5. Step 5. Airship — is made of — Duralumin. The frames of zeppelins.
6. Step 6. Duralumin — is material for — Aeroplane. All-metal aircraft.

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