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Become an explorer and perform three standard tests! You can invite the whole family to the mini lab, the reagents are completely safe. Interested? Let's find out. What's wrong with the water in the tap?   Rust and hardness are...
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Summer rain. In the stationary version. At the dawn of its appearance more than a century ago, the shower head was fixed above the head. The convenience of this arrangement was not in the slightest doubt until half a century...
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