Distilling pure anhydrous ammonia

I have a few upcoming projects that require anhydrous ammonia. In this video, I show how to distill it from "ammonia water" similar to common glass cleaner.
http://en.wikipedia.org/wiki/Birch_reduction
http://www.engineeringtoolbox.com/ammonia-pressure-temperature-d_361.html

Magnetic Propulsion

This is a neat little demo that shows how permanent magnets can be used to create propulsion along a conductive copper track

How Digital Light Processing (DLP) works

Digital Light Processing projectors use a chip that is covered with tiny mirrors that tilt back and forth. When the mirror is tilted one way, it reflects light out through the front of the projector, creating a bright pixel. When the mirror is tilted the other way, the pixel is dark. In this video, I explain how DLP works and show a macro-scale model.

Review of National Instruments VirtualBench

The VirtualBench is an all-in-one piece of electronic test gear that combines an oscilloscope, logic analyzer, function generator, DMM, triple output programmable power supply, and an 8-channel digital I/O bus.  It can be controlled with a dedicated NI app, or programmatically controlled with LabView or C.  I show the device's usage and duggest which situations may benefit from using this device.

The science of wineglass tears (or wine legs)

The surface tension of water and the evaporation of ethanol produce an interesting effect in a wineglass known as "tears" or "legs".  The process is caused by the Marangoni effect, which explains how toy soap boats work among other interesting things.