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Those are so cool. They're the only way (I know of) that you can see molecules with your naked eye. Actual molecules! That's practically at the level of atoms, and you can see that microscopic stuff!
**Edit: they are not, in fact, molecules. See replies for more info. **
Also red blood cells. It's pretty cool that if you stare at the sky (not the sun; please not the sun) you can sometimes see red blood cells move in the back of your eye. Single cells! Amazing.
Err, I don't think that's right. That's physically impossible. Only electrons are small enough to visualise molecules and atoms, which is why you need electron microscope to see those.
Whoa, my optometrist told me that's what they are and now I'm really disappointed.
Considering their shape and what you said about them being impossible to observe in visible light... I guess those branch-like pieces are cell organelle fragments instead?
Dang, and here I was excited to be seeing molecules.
They are individual cellular organisms but they're not molecules. Individual molecular structures are too small for light to interact with so no matter how much you magnify them you're never going to see them.
That's why things like electron microscopes were invented. You can't just build bigger and more powerful microscopes it doesn't work.