Scientific American: A new 2,100-square-meter building outside Frankfurt, Germany, houses a series of chambers that can simulate a hot, humid day or temperatures so frigid that metals crack, and every punishing weather scenario in between. It’s all for testing one product–solar photovoltaic panels–and it’s the third such facility opened since 2008. Underwriters Laboratories, perhaps most recognizable for the ubiquitous “UL” in a circle that is printed on many gadgets, was founded back in the late 19th …