This piece of Ulexite AKA hydrated sodium calcium borate hydroxide AKA TV Rock naturally projects an image of whatever is placed below it onto its surface.
The entire 120 year National Geographic archive of every single issue, page, article, advertisement, map and photograph from 1888 to 2008 has been digitally... More
Innovative device lets you easily zoom in and explore the microscopic world without any interference from wires!
These powerful binoculars give you a whopping 144X magnification, the longest zoom of any binocular available, with a field of view of 131' at 1,000 yards!
