(CBS News) — The latest “American Girl” doll seems like the kind of kid more interested in exploring brave new worlds than, well, playing with dolls. Mattel (MAT) describes the latest doll in the popular toy line, which launches today, as a “creative, confident 11-year-old girl and aspiring astronaut who dreams of being the first person to go to Mars.” The company said that “Luciana Vega,” described as being of Chilean descent, is meant to help girls defy gender stereotypes […]