Cover: Mariah Carey 20 Questions: Mariah Carey Features: The Real Cost of War (A look at the increased psychological risks to the average soldier and the attempts to discount post-traumatic stress disorder as a condition); The Year in Music 2007 (Our annual look at who hit all the right notes); Business Class (We highlight what we consider to be office essentials, from stylish seating to sleek gadgets). Interview: Jeremy Piven Pictorials: Hot For Teacher (Do you like apples? Former educator Erica Chevillar shows hers); Playmate: Tyran Richard (Cajun country, the land of gumbo and Tabasco, produces yet another hottie; Miss March); Playboy's 25 Sexiest Celebrities (Sure, we gave you the girl next door, but we also honor the sexy and the glamorous). Playmate: Tyran Richard