Scientists. If we didn't know better, we'd think they were messing with us all the time. But we know they're usually there to help, which is the only reason we've watched this video (after the break) 27 times this afternoon. Apparently Northumbria University researchers motion-captured a bunch of dudes dancing really hard, then mapped their movements to these fun models -- devoid of any popped collars, Ed Hardy vests, or Gucci bling to keep things scientifically pure -- then asked 35 women to rate the dancing on attractiveness. Turns out the left wrist, right knee, head, and trunk are most important parts to shake if you're a dude trying to catch the most feminine eyes in da club. Seems like those parts communicate a man's "reproductive quality" the most effectively. Now excuse us -- we've got a lot of work to do before Happy Hour rolls around.