Why Are There Yellow and Orange Bumps On Train Stations

Have you ever noticed those yellow and orange bumps on train stations? What are they there for? To attract your attention or maybe just for the sake of design? Every object surrounding us in everyday lives has some meaning. And even if we don't know it, it serves its purpose.
Here're 14 facts you won't use in life, but they are still cool to know. In this video you'll find out why Boeing uses potatoes to test wi-fi and why we associate citrus smells with being clean... Spoiler: it has something to do with household cleaning of the past.
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