Test buffer solution vial and saw: what they have in common

1. Step 1. Test buffer solution vial — is part of — Rapid test. It extracts the antigen from the sample.
2. Step 2. Rapid test — is made of — Cellulose. The strip is nitrocellulose.
3. Step 3. Cellulose — is material for — Wood pulp. Wood cellulose.
4. Step 4. Wood pulp — is material for — Jigsaw puzzle. Cardboard.
5. Step 5. Jigsaw puzzle — uses — Saw. Cut out with a fretsaw.

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