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.

The team puts more science to the test, including new stem-cell research and the Nocebo effect (placebo's evil twin). And Dallas Campbell goes to a memory boot camp.