This video is just awesome. No two ways about. Science stuff: 1) the bubbles are multicolored due to the different film thicknesses scattering the different wavelengths of light to different degrees like a prism and 2) you can see when the bubbles pop that the film is trying to minimize is surface area to volume ratio. A bubble has a very large surface area to volume ratio, while a droplet has a very low surface area to volume ratio.
Microfluidic devices are really cool because at the micrometer length scale forces like surface tension have a greater effect than forces body forces like gravity. This makes the flow in these channels have very low Reynolds numbers, so the flow is generally laminar, and thus mixing occurs very slowly. The Foch Lab likes to set colorful microfluidic displays to classical music. Enjoy!
