This week This week A sonar mapping device is hoisted back on board the Australian Defence Vessel Ocean Shield during buoyancy testing. It is a vital piece of equipment in listening for the sonar ping from MH370's flight recorder. Mass Communication Specialist 1st Class Peter D. Blair/U.S. Navy via Getty Images NewsPhysical Sciences The search for MH370: Why can’t we find it? How science and technology has measured up to the task of finding the Malaysian aircraft. by Philip Dooley News Life Sciences News Life Sciences 'Designer' plants could seed cheaper biofuels by Daniel Cossins Genetic tweaks make it easier to pulp plants. News Life Sciences News Life Sciences Is Tamiflu a waste of money? by Elizabeth Finkel Studies disagree on benefits of stockpiling flu treatments. News Life Sciences News Life Sciences Health experts dismiss homeopathy by Tim Dean No evidence that the treatment is better than a placebo. Opinion Life Sciences Opinion Life Sciences An alimentary guide to microbes by Norman Swan Scientists have little idea exactly what microbes live in our intestines. Culture Physical Sciences Culture Physical Sciences In the footsteps of Carl Sagan by Elizabeth Finkel Cosmos redux is a worthy successor. News The Future News The Future Editor's choice: Violins, tectonics and stem cells by COSMOS editors A round-up from the scientific and technical journals.