Hydroponics and internal combustion engine: what they have in common

1. Step 1. Hydroponics — uses — Mineral wool. Hydroponic plants grow in mineral wool instead of soil.
2. Step 2. Mineral wool — is material for — Silencer. A fibrous packing damps the sound.
3. Step 3. Silencer — is part of — Internal combustion engine. A silencer.

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