In this episode of Dara O'Briain's Science Club, the team and guests focus on size. They explore big data, dark matter, bacteria, stock market trading, and more. Dara O'Briain's Science Club combines lively studio discussions featuring some of the world's most eminent scientists, with exciting experiments, studio demonstrations and film reports of cutting-edge science stories. Each loosely themed episode explores the ideas that are transforming our lives and our understanding of the world.

Streaming video file encoded with permission for digital streaming by Infobase on October 01, 2015.

Introduction: Size Matters: Dara O'Briain's Science Club --(1:38) -- Bacteria -- (3:12) -- Antibiotic Resistance -- (3:40) -- Size and Living Things -- (3:06) -- Surface-to-Volume Ratio -- (2:57) -- Big Data, Little Lives -- (4:16) -- Human Face of Big Data -- (3:07) -- Scales of Existence -- (2:18) -- Dark Matter -- (4:22) -- Theoretical Physics -- (3:10) -- Demonstrating the Innards -- (5:31) -- Value of a Millisecond -- (3:34) -- Other U.S. Trading Centers -- (3:13) -- Population Explosion -- (5:17) -- Credits: Size Matters: Dara O'Briain's Science Club -- (Series 2) (0:44).