Overview: The Big Picture It's the curse of every dieter. Shed a few kilos. Then pile them all back on again. We've always blamed ourselves, we should have kept up with the exercise, shown more self-control. But researchers in Melbourne have come up with another more "palatable" explanation. They're discovered that a person's weight is predestined, that genetically your body will fight to put the weight back on again. All without you even knowing about it. There is some good news though: the new findings are turning the science of weight loss on its head. Reporter: Liam Bartlett Producer: Howard Sacre Ships of Shame They're sold to us as floating pleasure domes - luxury hotels on the sea - where every day is perfect and the party never stops. But scratch the surface of the cruise ship industry and the truth isn't so dazzling. Behind the pina coladas and the smiles lies a murky world of sexual assault, drugs and violence, even murder. Incredibly, one passenger goes missing overboard every two weeks. Now, you'd think the big cruise companies would be desperate to get their industry shipshape. You couldn't be more wrong. Reporter: Allison Langdon Producer: Gareth Harvey Living on the Edge Bands don't get much bigger or louder than Aerosmith. For 40 years, Stephen Tyler and his crew have been rocking stadiums full of adoring fans. Backstage, though, things haven't been quite so harmonious. There's been bitter feuds, battles with drug addiction and major health scares. Yet through it all, they've kept performing. Their live concerts are legendary. But as Lara Logan from the American 60 Minutes program discovered, the real entertainment happens behind the scenes. Reporter: Lara Logan, CBS 60 Minutes Producer: John Hamlin