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There are lots of great PowerPoint resources on this site. Select the link to "Countdown Timers for PowerPoint" to get a wonderful variety of free downloadable PPT timers that you can customize to meet your needs.

This PDF, created by the Loudoun County Assistive Technology Team, shows how to create a basic countdown timer in PowerPoint. Countdown timers can support time management and organization. Add your favorite graphics, such as a school mascot, to customize it for your students.

Short tutorial on creating a customized countdown PowerPoint timer. Great for time management and organization!

Free downloadable PowerPoint countdown timers, from 1-60 minutes. Great for time management and organization!

Free Online Timers

This helpful YouTube video shows how to create countdown timers in PowerPoint.

Free downloadable PowerPoint countdown timers. Great for time management and organization!

Online Free Visual Timer

This free downloadable PowerPoint slide show created by Dave Foord includes a wealth of PowerPoint countdown timers that you can customize to meet your needs. Great for time concepts, time management, and organization!

Online timer stopwatch counts up or down, using various time formats, with or without alarms, in a loop or not, and in various display colors, sizes and fonts

fractions and mixed numbers review, timer, immediate feedback

Everybody needs a stopwatch at some point -- and there's never one around! Well... Now there is! Online Stopwatch! A Simple, Fast Flash Online Stopwatch and Online Countdown timer always available when you need it.

At exactly 10:17am ET today the Jovian - Plutonian Gravitational Effect will impact the gravity on Earth. British astrophysicist Patrick Moore discovered that the combined gravitational pull of the alignment of Jupiter and Pluto will cause one to spend a significantly longer amount of time "floating" in the air when jumping up due to an increase in gravitational pull from the celestial objects. Experience the phenomenon by setting a timer and having your entire class jump up into the air at exactly 10:17am. The experience is said to be similar to that of riding a roller coaster or jumping in an elevator as it begins to descend. Experience Zero Gravity! The effect lasts for approximately one minute.

"The Jovian-Plutonian gravitational effect is a hoax phenomenon stated to cause a noticeable short-term reduction in gravity on Earth that was invented for April Fools' Day by the English astronomer Patrick Moore and broadcast on BBC Radio 2 on 1 April 1976."