How are mushrooms grown and harvested?

Seriously, though. We planted a garden a few weeks ago, and we all know the soil-water-sun combination well enough, but what about mushrooms? In my mind I imagined spores being blown out over a field and then a giant wheat-thresher rolling over the shrooms, picking them up as it went along, but obviously it can't be done that way. The actual method is pretty cool. Here are some nifty facts:

A mushroom doubles in size every 24 hours!

Millet seeds are "inoculated" with mushroom spores and then the seeds are spread out over compost. (Can a person be inoculated? That would be creepy . . .)

If you dig 12 inches down in, the compost used to grow mushrooms is too hot to touch when it is being prepared.

Here's a link that goes over the process. Fun stuff!

http://www.fabulousfoods.com/index.php?option=com_resource&controller=article&category_id=224&article=19955