Architects like to blather on about changing the way we live, but with Frank Lloyd Wright it was not all hot air. "The greatest American architect of all time", as the American Institute of Architects called him, may have come of age in the Victorian era, but he was implacably opposed to fust, gloom and all things antimacassary. Instead of poky, dark fortresses against the elements, he made homes that were open-plan, airy and in sympathy with nature - like Fallingwater, the concrete and stone palace constructed over a waterfall in the Pennsylvania countryside. Fifty years after Wright's death, his designs still appear strikingly modern. Susan Marling talks to his colleagues, and visits some of his creations, in The Great Architect of Home (11.30am, Radio 4).

Power Failure? (9pm, Radio 4) is pondering the future of batteries. They're smaller and more powerful than they were 150 years ago, but overall progress has been slow. Apparent improvements actually have more to do with gadgets requiring less power. But is that about to change? Mark Miodownik investigates.