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The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time, a method of growing produce using a transparent film: film farming. The film is made from hydrogel, a moisture-absorbing material used in disposable diapers . Sow seeds on top, and they germinate and create seedlings, leading to vegetables and other produce without soil! We dive into the little-known story behind this unique Japanese farming technology.