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Why do ion engines need a vacuum to work?

A brief explanation why ion engines need a vacuum

http://bit.ly/PndiV2

Bell Jar

Fun demonstration of air pressure with shaving foam and a vacuum pump.

http://phun.physics.virginia.edu/demos/bell_jar.html

Build a simple spectroscope

Make a spectroscope using a CD, a box, a tube and some tape.

http://scitoys.com/scitoys/scitoys/light/cd_spectroscope/spectroscope.html

How Television Works

Containing a brief description of how TV works, from pixels and motion to inside a cathode ray tube. Tthis excellent set of pages is interactive and is part of HowStuffWorks.com.

http://www.howstuffworks.com/tv.htm

Daredevil egg - Marvin and Milo

A Marvin and Milo activity about intertia. All you need is an egg, a glass of water, an empty smarties tube and a placemat.

http://www.physics.org/marvinandmilo.asp?id=40

Electromagnetic Waves

Description of electromagnetic waves, which move energy through empty space (a vacuum), stored as part of an electric and magnetic field.

http://hyperphysics.phy-astr.gsu.edu/hbase/emwav.html#c1

Ever thought about how a brick of vacuum packed coffee goes soft as soon as it's opened? Understanding the behaviour of granular materials could help physicists to better understand not only coffee ...

http://www.firstscience.com/home/articles/big-theories/coffee-physics_1213.html

Dennis Gabor

Dennis Gabor (1900 - 1971) work led to the development of a number of devices including: a holographic microscope, an analogue computer, a flat thin colour television tube, and a new type of ...