Analog Computation in Engineering Design

Lead is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low...

Don't know your blood type? Find out in minutes with this sterile blood type testing kit. Includes everything you need to take the test at home. Nothing needs to be sent to a lab. Tests for A+/-, B+/-, AB+/-, and O+/-...

In the past, glass manufacturers added uranium to glass for color. Uranium has since become more strictly regulated, but the old uranium glass objects are still floating around. Because of the uranium content, these marbles glow bright green under ultraviolet light. ...

Special edition 3.5" iron-on NASA mission patch for the Apollo 11 moon landing. Free shipping. 

Ferrofluid is an iron-based liquid that reacts in the presence of a magnetic field.  Comprised of nano-scale magnetic particles suspended in a transparent liquid, ferrofluid aligns itself to a magnetic field, making it easy to visualize the field. With this amazing magnetic...