Latest Issue 23 Feb 2015 Latest Issue 23 Feb 2015 A worker installs solar panels containing photovoltaic cells at the new Solarpark Eggersdorf solar park on September 4, 2012 near Muencheberg, Germany.Sean Gallup/Getty Images NewsTechnology Printed solar cells poised for a breakthrough Research into alternatives to silicon solar cells is making rapid progress. by Viviane Richter News Life Sciences News Life Sciences Chimps learn to grunt with a Scottish 'accent' by Belinda Smith Dutch chimpanzees learn to fit in with the locals. News Space News Space Space travel is bad for your health by Viviane Richter How to mind our immune system on the way to Mars. Culture Technology Culture Technology The smallest sculptures ever made by Megan Toomey There is nothing small about this scientific feat of art. Opinion The Future Opinion The Future Inspiration for colonists of Mars by Wayne Gibbings This novel could serve as a NASA recruiting tool. Opinion Technology Opinion Technology Why silicon computers rule by Alan Finkel Don't believe reports that the silicon chip will soon be outdated. Feature Life Sciences Feature Life Sciences From the vault: Let's talk about sex by COSMOS editors A look back at some of our most popular articles.