Adwords - Mesothelioma, mortgage etc...

So my friend showed me this site: View Bids. It actually shows you what people are bidding on for words and per clicks. Like mortgage is something like $4+, Mesothelioma is at $11 + . Now I ask you WHAT IS: Mesothelioma ?

I think is a type of cancer, I guess maybe I should click on a link and find out?

Good tool for people back pocket though. Cause you never know when someone might click on a Mesothelioma link.