What did ESA's Rosetta-Philae discover at comet 67P/Churyumov–Gerasimenko?

The Rosetta Philae mission brought us closer to a comet than ever before, with bold ambitions and science goals. But what did it actually discover while it was at 67P/Churyumov–Gerasimenko?
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Видео What did ESA's Rosetta-Philae discover at comet 67P/Churyumov–Gerasimenko? канала Astrum