What's The Smallest Thing In The Universe?

What’s the smallest thing in the universe? It's complicated. After all, fundamental particles are what physicists call the most basic building blocks of matter, and they are so minuscule that no current technology, nor technology we can even imagine, can detect their size. But if the universe's smallest particles are that small, how do scientists know so much about them -- or do they? To find the answers, HuffPost Science's Jacqueline Howard visits the Fermi National Accelerator Laboratory.
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