When giving a lecture about the significance of punctuation, the academic professor was interrupted and arrested by the police for murdering his wife, a receptionist of a kindergarten. The police found some photos he deleted from their e-album showing that they used to have a gay life. But, fed up with her wrinkled face, he murdered her instead of divorcing her to avoid fortune division. He cut up a kind of seashell with a sharpened knife, and hammered it into powder on a skateboard, and made at most one gram, which was enough to accelerate one’s pulse until he or she dies. This kind of poison can date back to 10,000 BC when people rubbed it on spears to kill beasts. The professor mixed the poison with onion, watermelon and yogurt for his wife. Howling and scratching her chest, she felt dizzy and died soon.