Mind-Blowing Japanese Inventions You Won't Believe

10. Rain Alert

What it is: Elevator indicators that warn of rain Invented: 2019 Average Cost: Not specified In Osaka, where precipitation occurs frequently, rain indicators placed in elevators glow red to remind users to bring umbrellas.

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Awesome Inventions/TTwitter.com ©Rain Indicator This basic yet efficient system keeps residents prepared for surprise rainfall, preventing them from getting caught unprepared.