Polarized light around a young nebula. Named prior to telescopes that revealed its true shape, the Boomerang Nebula is a very cold place with a temperature of about -459 degrees Fahrenheit or 1 K. Credit: NASA, ESA and The Hubble Heritage Team [STScI/AURA].
Water Flow from a Spouting Cylinder
A spouting cylinder provides a visual demonstration of incompressible fluid pressure as a function of depth. Since water is nearly incompressible this is an experiment children can do themselves.