Book (Practical) Home economics and life sciences It is easy to understand preserved edition illustration, it is easy to understand! A book that you can repair anything by yourself.

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Home Economics and life environment studies
It is safe if you can fix it or make it yourself in case of emergency! It is definitely a good deal! From plumbing troubles such as water leakage from faucets, repairs of floors, and maintenance of bicycles! If you ask a repairer, you will spend thousands of yen to ten thousand yen. If you know the knack, you can fix it by yourself! Parts cost only hundreds of yen to thousands of yen! There are more information available for corona disinfection such as "surfactant" contained in kitchen detergent, "hypochlorous acid water" produced by electrolysis of salt water, "quaternary ammonium salt" contained in wet tissues, etc.!