The composition of teeth are such that when exposed to a black light, they absorb the UV light and glow! A radical video explores how different objects glow in the dark. The narrator discusses how different types of chemicals, called...

Why do stars appear to glow? And why is it that some stars seem brighter than others? This is the focus of a video that explains how stars get their glow and how apparent brightness is determined by distance, rather than size.

Today Phil's explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots...

Leopold Survage created a series called Colored Rhythm; he had this idea about making an abstract film this idea that survives himself said to throw off paintings last shackle and that is immobility, making painting move. He chose a very...