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Quentin Cooper looks at the outbreak of Legionnaires' disease in Scotland. He speaks to leading bacteriologist Professor Hugh Pennington about the causes of the disease, its history and why Legionnaires', one of the world's most dangerous bacterial pathogens, is so hard to detect.

We look at the transit of Venus. Venus passed between the earth and the sun earlier this week - and won't do so again for over 100 years. Observed in past centuries this phenomenon is credited with helping devise methods to navigate the earth's oceans, but it is also helping us now to detect distant planets that we cannot see.

And we catch up with 'So You Want to Be a Scientist' finalist Val Watham. After a lot of hard work analysing the results, Val can finally shed some light on whether horizontal or vertical stripes are more flattering.

Producer: Julian Siddle.