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Building your own slides is a great way to get more from your microscope — here's how to make them
Looking at the intricate details of the world through the lens of a microscope is a fascinating and fun experience, but you ...
A metal oxide is added to the lens material to create the difference in tones. The top portion of the lens has a darker tint, while the bottom has a lighter tint or no tint at all. The sunglasses ...
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