Physicists test Einstein theory in Stanford's 'mystery pit'

paloaltodailynews.com — Located in the basement of the university's Varian Physics Building, the 25-foot pit is where the team is currently testing Einstein's principle of equivalence. The pit's history is a mystery, but according to lore it was built during the 1960s for space gravity research. Jan 6, 2008 View in Crawl 4