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Get flash to fully experience Pearltrees
If you're on Windows, need to use OS X, but don't want to buy or build a new computer , reader Bobby Patton shows us how to run Snow Leopard in a virtual machine on Windows with just a few tweaks. We've shown you how to install Snow Leopard in VMWare , but if you haven't purchased VMWare, you can now do it using previously mentioned , free program VirtualBox . Apart from VirtualBox, you'll also need an OSX86 ISO. The group Hazard has put out a good patched Snow Leopard installer that should do fine (just search for it on Google).
How to Run Mac OS X in VirtualBox on Windows - Lifehacker
NIEHS Kids Page -- Optical Illusions
Gotcha! But the rest of these optical illusions are on the level. What are illusions? Illusions trick us into perceiving something differently than it actually exists, so what we see does not correspond to physical reality.