In this edition: We discuss whether drug policy is working, why Australia is experiencing megafires, and what can be done about fatbergs.

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News: Miscarriage and PTSD, and a remarkable refugee professor – We find out how many women experience post-traumatic stress disorder after miscarriage, and learn about the remarkable life of a venerable maths professor.

Is drug policy working? – Former government adviser Professor David Nutt tells us how restrictions on tobacco are working, but that hard drugs policies have in some cases made problems worse, and what can be done.

Why is Australia facing megafires? – We find out what’s making Australia’s wildfires so bad they have become megafires, including the factors involved in their spread and how much climate change might be to blame.

The big, gross problem of fatbergs – Huge accumulations of fat and unflushable material can block drains and city sewers, but how do we work out the best way to prevent them and remove them?

This feature is an excerpt from ' Never Lick the Spoon ' – a monthly podcast from Imperial's Institute for Molecular Science and Engineering .

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