Waterproof fabric and nuclear reactor: what they have in common

1. Step 1. Waterproof fabric — is made of — Natural rubber. Rubber between the layers.
2. Step 2. Natural rubber — is material for — Eraser. Rubber.
3. Step 3. Eraser — is used in — Pencil. Erasing.
4. Step 4. Pencil — is made of — Graphite. The lead is graphite mixed with clay.
5. Step 5. Graphite — is material for — Neutron moderator. The first reactors used graphite.
6. Step 6. Neutron moderator — is part of — Nuclear reactor. A moderator.

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