Latest Issue 5 Oct 2015 Latest Issue 5 Oct 2015 Gravitational waves are fluctuations in the curvature of spacetime, travelling outward from their source. The source of the gravitational waves could be a massive object, or some high-energy event.HENNING DALHOFF / Getty Images NewsPhysical Sciences Einstein's gravitational waves remain elusive The Parkes radio telescope failed to detect gravitational waves after an 11-year search. by Alan Duffy News Life Sciences The virus that could help stop HIV by Viviane Richter Not only does the pegivirus not make you sick, it can help you fight off other diseases. News Space Massive galaxies rob gas from little neighbours by Belinda Smith Astronomers discover why the biggest galaxies keep getting bigger. Feature Mathematics Emilie du Chatelet: the woman science forgot by Robyn Arianrhod Émilie du Châtelet explained Newton to the French. Opinion Society Designer babies crawl closer by Laurie Zoloth Are humans mature enough to engineer human embryos? Review Earth Sciences Review: Atmosphere of Hope by Bill Condie Tim Flannery looks on the bright side. Opinion Society Publisher's note: A case for better science teaching by Alan Finkel How can we make science relevant to teenagers?