Rachel Mills on volcanoes under the sea and how metal deposits feed the oceans.
Jim Al-Khalili discusses quarks and popularising particle physics with Frank Close.
DIY Faecal Transplants? Don't do this at home, immunologist Sheena Cruickshank tells Jim.
John Taylor tells Jim Al-Khalili how his inventions transformed the electric kettle.
Jim Al-Khalili talks chimp gestures with Dr Cat Hobaiter.
Professor Dame Caroline Dean on why some plants need cold before they can flower.
Carlo Rovelli describes how he abandoned the concept of time.
Callum Roberts on coral reefs and the urgent need for marine reserves.
Psychologist Stephen Reicher talks to Jim al-Khalili about how we behave in crowds.
Jim Al-Khalili talks to Clare Grey about the batteries that could power our future.