who has a Mac? everyone!

1. In my "real job" (surgery) - at least 95% of folks use Windows laptops, with the rest using Mac. I've never met another MD in real life who uses Linux, and perhaps 5% have even heard of it.
2. At this year's Google Summer of Code Mentor Summit, I would guess about 70% of laptops ran Linux, 25% Mac, and 5% Windows.