A physicist who writes science fiction, talking up the future of materials at the World Economic Forum, and part two of a clinical trial diary.

The podcast is presented by Gareth Mitchell, a lecturer on Imperial's Science Communication MSc course and the presenter of Click Radio on the BBC World Service, with contributions from our roaming reporters.

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News: Cleaning up the oceans and investigating cravings  – research shows the best way to clean up ocean plastics is to focus on the coasts, not on the Great Pacific garbage patch, and a trial is launched to see if gut hormones can influence cravings for food, alcohol and cigarettes.

Science fiction astrophysicist  – Dr Dave Clements researches galaxies far, far away, but also turns his creative mind to writing science fiction.

Imperial at Davos  – Imperial academics showcase the role of materials at this year’s World Economic Forum in Davos, from Professor Natalie Stingelin’s efficient windows to Professor Neil Alford’s maser technology.

Ebola vaccine diaries episode two – what happens during a clinical trial for a new ebola vaccine? Our reporter has had her first vaccination – were there any side effects?