It's one of the largest criminal industries in the world, worth billions and responsible for thousands of murders, but can we win the fight against the illegal wildlife trade? We speak to the foot soldiers of this battle: a scientist whose new techniques led to the capture of some dangerous criminals, a member of Border Force who intercepts ivory as it enters the country and the man with a gun facing off directly with the poachers. We also hear about the animals at risk, and why time is running out. Plus, a revelation from the early Universe which might change how we do physics today, why unexpected rain was a course for celebration for some scientists and the crickets who have been found to use tools to amplify their songs.

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