The first accurate atomic clock was built in 1955. This led to the internationally agreed definition of the second being based on atomic time. The second is currently defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the caesium atom.

3D animated Fall Leaves with music and customizable background. Choose the combinations of leaves you like best. Select your own background picture. Select your own looping audio tracks!

Any Flash Screensaver Maker is an easy to use and powerful tool that helps you convert Flash movies into a Screensaver within minutes. It also allows users to build self-installation packages (*.exe) for distribution.

This 3d snowflakes screen-saver will bring peace and quite of a winter forest to your desktop! 3d snowflakes slowly coming down in mysterious and snowy forest. Watch the wonderful landscapes of a winter forest.

The free screensaver, Asteroids, was created by RateMyScreensaver.com and contains 15 high resolution images of Asteroids. Asteroids, also called minor planets or planetoids, are a class of astronomical objects.

The dreadful Army of Darkness is leaving its stronghold to embark on a bloody campaign to conquer the world. Watch the endless column of blood-thirsty Trolls, Orcs, Mumakils and great machines of war on their way to the land of the final battle between good and evil.

This screensaver shows 25 amazing animal pictures.