The Inquirer reports that University of Pennsylvania professor Rafael Robb will stand trial for his wife’s murder after a preliminary hearing was held this week. Although there is a natural – if unfair – tendency to suspect a spouse when a woamn is killed, this case poses some interesting problems. Police have found neither a muder weapon, nor the bloody clothes that Robb presumably wore when he killed his wife. No slam dunk here, I’d say. But then, I said the same thing about Craig Rabimowitz.