Toothpaste and tank: what they have in common

1. Step 1. Toothpaste — is used in — Toothbrush. Toothpaste.
2. Step 2. Toothbrush — is made of — Nylon. Nylon bristles (1938).
3. Step 3. Nylon — evolved into — Kevlar. Aramids are relatives of polyamides.
4. Step 4. Kevlar — is material for — Body armour. Kevlar.
5. Step 5. Body armour — works like — Tank. One idea of protection — armour — at different scales.

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