Riddle: Cameron Fitzgerald, a famous scientist, was found killed in his laboratory. Detective R.I. Dill was called to the scene. The only clue was a written note saying "66, 57, 7 - P.T" Detective Dill found 4 suspects who were nearby at the time of the murder. Jake Willow, Cameron's best friend, Samantha Fitzgerald, Cameron's wife, Dylan Hemlok, Cameron's assistant, and Amy Dill, Det. Dill's sister and Cameron's chauffeur. After re-reading the note, Detective Dill immediately knew who it was. Who was the killer and how did Detective Dill know? (Hint - The answer is science-related)
Answer: It was Dylan. The note was referring to the periodic table of elements, a.k.a 'P.T' The numbers 66, 57 and 7 are (in order): Dysprosium, Lanthanum and Nitrogen. Dysprosium is symbolized by 'Dy', Lanthanum for 'La' and Nitrogen is 'N'.