Astronauts may have fun drinking beverages like Pac-Man gobbles snack pellets: releasing some droplets out of a bag then swallowing them up before they float away. Capillary Flow Experiment(Opens in a new tab) say the cup functions similar to those on Earth by harnessing the combined effects of surface tension, so-called "wetting" conditions, and cup geometry. "But the nature of the 'plumbing' solution of the cup was earth-like enough as to pass with limited concern