Latest Issue 4 May 2015 Latest Issue 4 May 2015 Chris Hughes / DMAX FeatureLife Sciences Microbial gangs are organised killers Microbes can work together with devastating effect. by Branwen Morgan News Technology News Technology The most accurate clock ever made by Cathal O'Connell A strontium clock can tick for 15 billion years and not lose a second. News Life Sciences News Life Sciences A kinder, more personal cancer treatment by Viviane Richter Two new devices improve the effectiveness of chemotherapy. News Technology News Technology Radio interference wreaks havoc with telescopes by Belinda Smith Technology makes life easier for most – but not radio astronomers. News Life Sciences News Life Sciences Crack addicts hooked on their environment by Jee Hyun Kim We ask a scientist to describe their research and why it matters. Feature Society Feature Society From the vault: It’s opposite day by COSMOS editors A look back at some of our most popular articles.