Tomorrow I start teaching a half-semester seminar on privacy law in the honors program. Here’s Bruce Schneier with a timely piece about data, “the natural by-product of every computer mediated interaction. It stays around forever, unless it’s disposed of. It is valuable when reused, but it must be done carefully. Otherwise, its after-effects are toxic.” Schneier warns that future generations will look back on our heedless treatment of data as we look back with dismay on our forebears’ cavalier treatment of industrial pollution.