Morning linkage

The last few days have been a little frustrating from the point of view of exercise: in short, I haven't done any, as I continued to feel completely knackered! (Didn't help that it was ninety degrees yesterday - after a morning spent doing interesting but demanding student meetings, and trekking around town all afternoon for a couple doctor's appointments [annual physical, allergist, nothing stressful], I realized I was due to go home and collapse rather than making it downtown for an evening spin class.) But I had a long sleep last night and now feel pretty much back to normal - looking forward to midday spin at Chelsea Piers.

Fascinating piece about similarities and differences between working at a tech start-up and a chocolate start-up. (Via BoingBoing.)

Rooms transformed into large-scale camera obscuras.

Photographic backdrops in prison waiting rooms.

Why Jordan Ellenberg has a quarter of a million friends of friends on Facebook.

The art of Houghton Hall comes home.