Nerdy Thursday- Photoshop help

If you're like most of the millions of normal, non-nerdy people, if you want a black and white picture, you change your digital camera to the black and white mode. But if you're a pro photographer, and/or a nerd, you shoot it in color then change it to black and white using Photoshop! How do you do this? Go the Digital Photography School's blog to find out.