Diaper tabs and aeroplane: what they have in common

1. Step 1. Diaper tabs — is part of — Disposable nappy. They fasten the nappy.
2. Step 2. Disposable nappy — is made of — Polyethylene. Film.
3. Step 3. Polyethylene — is material for — Surgical mask. Non-woven polypropylene.
4. Step 4. Surgical mask — is made of — Cotton. Mikulicz’s masks were gauze.
5. Step 5. Cotton — is material for — Glider. Covered with cotton fabric.
6. Step 6. Glider — evolved into — Aeroplane. The Wrights added an engine to a glider.

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