Yves Rossy: Fly with the Jetman. Ben Saunders: Why did I ski to the North Pole? Diana Nyad: Never, ever give up. Ben Saunders: To the South Pole and back — the hardest 105 days of my life. Janine Shepherd: A broken body isn't a broken person. Roz Savage: Why I'm rowing across the Pacific. David Blaine: How I held my breath for 17 min. Diana Nyad: Extreme swimming with the world's most dangerous jellyfish. Julian Treasure: The 4 ways sound affects us.