Jem makes his own diamonds and then proves they aren't forever, Dr Yan explains the secret science of popcorn, and Dallas meets the team that hope to cure breast cancer.
In the second episode of the science series, Liz hits the beach with the RNLI to experience the power of rip currents; Dr Yan attempts to demonstrate evolution by drawing a couple of lines; and Jem is back in the workshop, turning everyday scrap into gold.
Liz investigates new stem cell research that could change organ transplant surgery, Dr Yan tries out the nocebo effect (placebo's evil twin), and at a memory boot camp Dallas Campbell discovers how to remember where he left his keys.
Jem investigates new research that suggests electric lights can play havoc with our sleep, Dallas downs his toothbrush to discover what causes tooth decay and gum disease, and Dr Yan explains why refreezing food is not a great idea.
Dallas investigates the possibility of a global helium shortage, Dr. Yan quizzes shoppers on their knowledge of radiation, and Liz demonstrates new airport security technology that can see through clothes.
In the aftermath of the Fukushima radiation scare, the team turns its attention to nuclear power. Jem climbs into a reaction chamber to explain how a nuclear power station works and what happened in Japan. Meanwhile, Dallas investigates the clean-up operation for radioactive waste, and Liz looks at what radiation does to the human body.
