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Principal Sponsors

The William and Flora Hewlett Foundation
The Hewlett Logo

Makes grants to address the most serious social and environmental problems facing society, where risk capital, responsibly invested, may make a difference over time.
The NSF LogoNational Science Foundation

An independent federal agency created by Congress in 1950 to promote the progress of science.

The King Saud LogoKing Saud University

King Saud University seeks to become a leader in educational and technological innovation, scientific discovery and creativity through fostering an atmosphere of intellectual inspiration and partnership for the prosperity of society.

Other Sponsors Logo

Troubleshooting Flash

This page will help you solve some of the problems people commonly have running our programs. If you can't solve your problem here, please notify us by email at the following address: phethelp@colorado.edu .

To run the Flash-based simulations you must have Macromedia Flash 8 (available free) or newer installed on your computer.

Get Adobe Flash Player

If you get a blank window when you try to launch a Flash simulation, you probably need a new version of the Flash player.

Older versions of the Flash Player can cause problems. Updating your flash player is recommended if you receive an error similar to:

Image of a Flash error message

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