I'm cleaning/organizing/purging my studio & office and have three DVDs to re-home: Introduction to Permaculture Design Harvesting Water the Permaculture Way and Establishing a Food Forest The first two are in the PAL format and since I bought the three together I'm assuming the Food Forest one is also but it's only marked NTSC, whatever that means. A geek friend tells me the PAL format can mess up American computers ??. I dunno, I'm a digital idiot and only tried them once and they wouldn't play, but didn't kill my computer either. All this to say, they probably need to live where the PAL format is native. Asking for postage costs only.