Our eyes are amazing, but they can only see things down to a certain size. Veins are small, but they’re still big enough for us to see, especially the ones closer to the surface of our skin. The blood flowing through them also helps make them more visible.
But to see REALLY tiny things, like cells or even atoms, we need special tools like microscopes. They’re like super-powered magnifying glasses that let us explore the invisible world!
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