Tetra Pak and autoclave: what they have in common

1. Step 1. Tetra Pak — is made of — Polyethylene. Polyethylene.
2. Step 2. Polyethylene — is material for — Surgical mask. Non-woven polypropylene.
3. Step 3. Surgical mask — uses — Germ theory of disease. Protection against droplets.
4. Step 4. Germ theory of disease — is used in — Sterilization. The rationale.
5. Step 5. Sterilization — uses — Autoclave. Sterilization by steam.

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