This Apple Science podcast features MIT’s Deb Roy, whose Human Speechome Project at the MIT Media Lab is exploring how children learn language. In its observation phase, the project will archive 200,000 hours of audio and video recordings, nearly a petabyte of data. Macintosh Xserves and Xserve RAIDs, interfaced with other computing platforms, collect, process, and store the vast dataset. TotalRecall, a Mac OS X-based application being developed at MIT, is the central tool for navigating and making sense of it all. With his research team at the MIT Media Lab, computing tools from Apple, and offering himself and his family as test subjects, Roy is developing that technology.