Latest Issue 11 Feb 2016 Latest Issue 11 Feb 2016 Flue gases spewing from coal-fired power plants account for nearly half of global CO2 emissions.Ira Block / Getty Images FeatureTechnology Can we bury the carbon dioxide problem? Carbon capture and storage could be a game-changer. by Elizabeth Finkel and Belinda Smith Feature Space Gravitational waves – your questions answered by Belinda Smith What are they, and why should we care? News Physical Sciences How does LIGO look for gravitational waves? by Cathal O'Connell The most sensitive ruler in the galaxy. News Space New perspective on an old Martian maze by Bill Condie The Noctis Labyrinthus region of Mars, the "labyrinth of the night". News Society Graveyard gives up secrets of migration in Imperial Rome by Bill Condie Who came to the Eternal City and from where? News Space SpaceX ramps up production of Falcon 9 rockets by Viviane Richter A busy launch schedule planned for this year.