Medicinal powder and oil lamp: what they have in common

1. Step 1. Medicinal powder — is part of — Tablet (medicine). The medicine.
2. Step 2. Tablet (medicine) — is made of — Chalk. Tablet fillers are chalk and starch.
3. Step 3. Chalk — is a kind of — Lime. Chalk is calcium carbonate, like limestone.
4. Step 4. Lime — uses — Kiln. Lime is made by burning limestone.
5. Step 5. Kiln — is made of — Clay. Kilns were built of clay.
6. Step 6. Clay — is material for — Oil lamp. Later — clay ones.

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