Hoberman Original Firefly Mini-Sphere Expanding Rings Glow in the Dark
You can use this for physics or astronomy to demonstrate the idea of an expanding universe, for mathematics to show the volume, surface area and diameter relationships of a sphere or for chemistry to model Charles adn Gay Lussac's Gas Laws as applied to a soap bubble. Great for a party.
Its system of polymer links expands and contracts almost effortlessly, changing in volume 30 times. Hang it from the ceiling and using the pulley, create an expanding mobile you can open and close. No assembly required - you will not want to put it down. Ages 4 and up.
For more information on Hoberman, you can go to www.hoberman.com. Hoberman Associates' work is centered on the fundamental idea that a designed object can transform the way a natural organism does. While the smooth transformation of size and shape is ubiquitous in the natural world, it is rare among man-made objects. Hoberman has extensive experience in building structures that change their form, an ability that can be used for many different functional applications. Instant spaces can be erected for temporary use. Walls and roofs can retract to transform a space from indoors to outdoors. Structures can transform to create exciting venues for performances and entertainment. Windbreaks and sunshades can respond to changes in weather or time of day. Expands from 5 to 12. Ages 4 and up.
All “glow-in-the-dark” products contain phosphors and have to be “charged” in order to attain a good glow. A phosphor is a substance that radiates visible light after being energized. After being exposed to light, most items will glow for at least 10 minutes. You may need to be in nearly complete darkness to notice it. The brighter the light and the longer the exposure, the better and longer the item will glow.