Three-time Formula 1 world champion Niki Lauda has died at the age of 70. Lauda, who underwent a lung transplant in August, "passed away peacefully" on Monday, his family said. The legendary Austrian, one of the best-known figures in motor racing, took the title for Ferrari in 1975 and 1977 and McLaren in 1984. For many, he will be remembered for his remarkable recovery and return to racing after