There are two representations of blackholes that I see in the popular media. Could you help me find the answer to a (or two) question about this please? 1. Feeding blackhole with an accretion disk - I assume that the accretion disk is a product / consequence of rotation (in addition to the feeding) ... but we all know what they say about assumptions ... ? 2. A blackhole passing in front of a star field, causing gravitational lensing. I don't know if these are rotating, or where to start looking for discussions on the topic. Any ideas? Basically, do blackholes always rotate? Any pointers / suggestions would be greatly appreciated. Regards, Noel.