Sure, you’ve rented The Silence of the Lambs and own the first five seasons of CSI:Crime Scene Investigation. But before you don that Sherlock Holmes cap, listen to the actual pros. In her lecture “The World of Crime: Analyzing Criminal Behavior,” Mary Ellen O’Toole—an agent with the FBI’s National Center for the Analysis of Violent Crime (aka the “Profiling Unit”)—discusses the real ins and outs of investigating a serial killer. Prospective mass-murdering nutjobs, take note: Although O’Toole’s lecture might clue you in to the types of conclusions an investigator can come to about your personality based on a crime scene, it’s drawn from cases that have been solved. So if you’re looking for helpful hints on how to avoid capture, you’d be better served by a trip to Blockbuster when O’Toole speaks at 6:30 p.m. at the Ripley Center Lecture Hall, 1100 Jefferson Drive SW. $35. (202) 357-3030. (Joe Dempsey)