MIT group makes low-cost dish to tap solar energy

Spencer Ahrens, a 23-year-old mechanical engineer, was on MIT’s campus last week, holding a wooden plank, surrounded by onlookers.Slowly, he turned that wooden plank before a series of mirrors that had been placed inside an aluminum frame, until the wood caught fire.That was quite a moment, recalled Matthew Ritter, one of the onlookers.“Let’s just say [...] continue reading world news