This simple log structure may be the oldest example of early humans building with woodAnother month of robust US job growth points to continued economic strengthScientists tinker with evolution to save Hawaii coral reefsFirst US moon lander in half a century stops working a week after tipping over at touchdownMoon landing attempt: Private US spacecraft enters orbitMaine sues biochemical giant over contamination from PCBNew York Philharmonic to tour China this summerMore than two million child sex abuse files found in man's possessionSpaceX launches 4 astronauts to the ISS for a 6Four astronauts from four countries return to Earth after six months in orbit