Bang Goes the Theory

Liz finds out how safe digital storage formats such as DVDs and memory sticks are, and whether the Cloud answers all our problems. Dallas and Jem see what it takes to properly wipe your computer memory, and Maggie Philbin revisits phone security after nearly 30 years, investigating how hackers can access your smartphone.

The team reveals how life surrounded by wireless signals affects us. Twenty-six years after his first report on the issue, Howard Stableford brings us up to date on the health risks of wireless signals; Jem explores the possibility of electricity without wires, and Liz reports on how mobile phone signals could protect us from illness and injury.

Jem visits a mega-plant in Sussex to investigate the future of recycling. Dallas explains how GPS works and how it is changing our world, and Dr Yan uses science to crack the classic magic trick in which a table cloth is whipped from under a dinner service.