Mac OS X on a PC?

Is it possible to run a Mac OS X on a PC? If "yes" HOW? If "not" WHY? Because Windows is running on Macs.
For Mac OS X on a PC? try this:

• Yes, you can. This website has a program that will allow you to do this via this link ... ... http://pearpc.sourceforge.net/about.html ... ... Good instructions on how to do it are listed here ... ... http://www.windowsdevcenter.com/pub/a/windows/2005/01/18/PearPC.html ... ... If that won't work, you could try to use a second hard drive and install it there.
  
• Yes, you can put windows on a mac but i don't see why you would want to. Step 1: go to http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore?productLearnMore=MA453Z/A buy mac osx tiger or a diffrent one. Step 2: Get the cd the put it in your computer the installation should start then follow th on screen instructions. ... Step 3 : get ready to break out the activation code during or after setup it'll ask for a activation code punch it in and u should be ready to go.