Aspirin is over 100 years old, but doctors still can't agree whether the benefits of taking it to prevent heart conditions or cancer outweigh the risks.Dr Mark Porter investigates. And - you've worked flat out to get on holiday, then come down with a stinking cold - is there any science behind why so many of us get sick on vacation. Plus ADHD - not in children, but ADULTS - why is it so hard for grown-ups to get a diagnosis.

Producer: Erika Wright.