Glass dish bottom and aeroplane: what they have in common

1. Step 1. Glass dish bottom — is part of — Petri dish. A flat dish.
2. Step 2. Petri dish — uses — Germ theory of disease. Growing bacterial cultures.
3. Step 3. Germ theory of disease — is used in — Surgical mask. Protection against droplets.
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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