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Scheduled Maintenance: Friday, May 24, 2013 at 6:00 PM Mountain Daylight Time

We will be upgrading the PhET servers on Friday, May 24 at 6:00 PM Mountain Daylight Time. We expect that the maintenance will last only 30 minutes. During this time, PhET ( may experience periods of unavailability. If you experience persistent issues, please e-mail the PhET Help Desk at

Thanks for your patience during our system maintenance.

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