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The team looks at the science of crowds, discovering how architects control the flow of crowds and how people in them can co-operate subconsciously.
Liz asks how safe digital storage formats such as DVDs are, and looks at the Cloud. Maggie Philbin revisits phone security.
The team reveals how life surrounded by wireless signals affects us. Howard Stableford looks at the health risks, and Jem explores electricity without wires.