Crittercam features a camera and environmental data sensors attached to an animal--from a shark or turtle to a lion or seal--that capture amazing wild behavior unaffected by humans. Such a simple idea yields fascinating results.
I don't get the National Geographic channel, but the movies look interesting.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.