When the conditions are right, a solid sphere can pass through a soap bubble without rupturing the soap film. As the sphere passes through the soap film, a pinch-off occurs and the soap film reseals itself. Predicting whether or not a soap film will rupture is dependent upon the speed [...]

When a hollow, elastic ball has been partially filled with a fluid, the rebound after being dropped is suppressed quite substantially. This principle helps a roller hockey ball to remain on the ground rather than bounce during play. Future research may lead to other other applications such as passive damping systems based on sloshing liquids. In the video below, [...]

We utilize the synthetic aperture particle image velocimetry technique to visualize the air flow past an artificial vocal fold. The video explains the technique in more detail and highlights the jets formed in the wake of the vocal folds.   The air passes through two silicone molds representing the vocal muscles inside the thorax. As [...]