Why Did Blackboards Turn Green? | The Science Behind Classrooms
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YouTube3D Master English
Why Did Blackboards Turn Green? | The Science Behind Classrooms
Why did classrooms around the world stop using blackboards and switch to green boards? This wasn’t a design trend — it was science. For decades, blackboards were standard in schools because white chalk showed clearly on dark surfaces. But as classrooms became brighter and learning hours increased, blackboards started causing glare and eye ...
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