A co-worker was a bit curious and aked me a question I couldn't answer.I'm a Mac user at home with a G5 and he is a Windows user (used to be a Mac user but he said he saw "The Light" and is now a dedicated PC user). He asked if the latest Mac OS (OS X) was Linux based or Unix based. I told him it was Unix based. The he asked what was the difference between Unix and Linux. I have no idea, so I thought I'd asks the question here. What is the difference between Unix and Linux?