This wee animated movie made by Harvard Scientists shows us what mitochondria look like when they’re hard at work producing energy inside your body (and your dog’s body, and maybe your dogsbody if you’re old-fashioned about work). It is as thrilling a glimpse into an unknown universe as Avatar–all in just over 2 minutes.

Hat Tip: io9, my favorite sci-fi/futurist blog. More links to related stuff there.