This java applet is a magnetostatics demonstration which displays the magnetic field in a number of situations. You can select from a number of fields and see how particles move in the field if it is treated as either a velocity field (where the particles move along the field lines) or an actual force field (where the particles move as if they were little magnets). This helps you visualize the field. You can also view the vector potential (A).
This app lets you choose from various wallpapers for your desktop.
Create your own dynamic desktop wallpaper for your Mac.
Classify desktop pictures whenever you change or get a new wallpaper.
Offshoots is for animating the wallpaper of your desktop with growing trees.
View planets and their moon from Solar System on your Mac.
Live Desktop makes the Mac desktop alive with amazing live themes.
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