Buzz Aldrin is a living legend: a bona fide American hero and tireless public servant. The Apollo 11 astronaut walked on the moon and took the first selfie in space. He’s even appeared on 30 Rock, The Simpsons, and in a Norwegian music video. Everywhere he goes, people adore and admire him. But as he reveals in No Dream Is Too High: Life Lessons From a Man Who Walked on the Moon, published by National Geographic, his life has had its challenges and tragedy. His mother took her own life. He himself battled depression and alcoholism. But today, at the ripe old age of 86, he is still dreaming big. (Find out about