Europe's oldest wooden staircase found in Austria Tue Oct 12, 1:05 PM ET Science - AFP VIENNA (AFP) - A 3,000-year-old wooden staircase has been found at Hallstatt in northern Austria, immaculately preserved in a Bronze Age salt mine, Vienna's Natural History Museum said. "We have found a wooden staircase which dates from the 13th century B.C. It is the oldest wooden staircase discovered to date in Europe, maybe even in the world," Hans Reschreiter, the director of excavations at the museum, told AFP. "The staircase is in perfect condition because the micro-organisms that cause wood to decompose do not...