First place in video. Credit: Greg Shirah and Horace Mitchell (NASA/Goddard Space Flight Center—SVS); Tom Bridgman (Global Science & Technology, Inc.)

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This bubbly, colorful video explains everything that you need to know about stem cells.

Honorable mention in video. Credit: Ben Paylor, Mike Long, Jim Till, Janet Rossant, Mick Bhatia, David Murawsky, and James Wallace (Stem Cell Network)

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And here's an explainer on how your immune system defends against bacterial invaders in the gut.

Honorable mention in video. Credit: Doug Huff and Elizabeth Anderson (Arkitek Studios); Zoltan Fehervari (Nature Immunology); and Simon Fenwick (Nature Reviews)

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This video shows plant cells in 3D:

Honorable mention in video. Credit: Geoffrey J. Harlow, Shou Li, Albert C. Cruz, Jisheng Chen, and Zhenbiao Yang University of California, Riverside

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And this animation explains how these weird blobby things—called Spherical Nucleic Acids—can treat genetic diseases.

People's choice in video. Credit: Quintin Anderson (The Seagull Company); Chad Mirkin and Sarah Petrosko (Northwestern University)