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If you like our videos, then you’ll love this. Our new series, Explained from Netflix Vox. To make sure you don’t miss it, go to netflix.com/explained and click the “ My List” button. | Vox

Cosmic rays are tiny bits of atoms racing by us — and even sailing right through our bodies — all the time. Physicists can’t figure out where they came from, but they have some wild hypotheses: | Vox