Hi, I'm Professor Dan Angus and you're listening to the HappyPod.

Hi, I'm Dr Graham Six and you're listening to The HappyPod.

A professor and a doctor no less, you heard them.

Welcome to The HappyPod from the BBC World Service.

I'm Jackie Leonard and in this edition will be in Australia, Germany, Canada and Colombia

where a 13-year-old girl kept her three younger siblings safe for 40 days in the rainforest.

Leslie Sinugara Duda was the one who kept her younger siblings alive.

It was a miracle.

Also in this podcast Natasha has full control.

She can alter the sales and the direction of the boat just by a sip and a puff.

The girl with cerebral palsy who sailed the Atlantic using her breath

and your favourite sounds, the ripping of Velcro,

Screech of Wheels on the floor, the oof, so when people get a nice hit,

piercing whistles from the officials, it makes my heart warm and pumps me up in a multitude of ways.

We begin with a story about observation, investigation and the upside of having a big internet presence.

It all began when Dr Graham Six, a skin cancer expert,

you might guess where this is heading, was watching the ABC evening news at home in Adelaide in Australia.

Professor Daniel Angus from Queensland University of Technology was on,

and as interesting as his interview was, Dr Six was distracted by the professor's appearance.

I was most interested in the brown spot on Daniel's right cheek,

reasonably large, about a centimeter in diameter,

and I thought that looked a bit strange and I was very suspicious that it might be a melanoma.

...