In the deserts of Africa and the Middle East, scientists have discovered tiny tubes that appear to have been made by something alive. In a press release, researchers from Germany's Johannes Gutenberg University Mainz described their shock upon finding these bizarre tubular tunnels in marble and limestone. "We were surprised," explained Cees Passchier, who first found the tunnels in Namibia 15 years ago, "because these tubes are clearly not the result of a geological process." In a new paper published in the Geomicrobiology Journal, Passchier and his colleagues described the bizarre physical properties of the weird tubes they found, first in […]