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 Features Mars exploration: a timelineOnly about half of the attempted missions to Mars have been successful. Here we bring you a timeline of our encounters with the Red Planet.  From 'gay plague' to global tragedyThe AIDS battle marks an important anniversary this week, bringing to mind victories of science and human spirit but also defeats, stigma and ignorance.  HIV/AIDS: a timelineIt kills 200,000 people every month and has claimed more lives than World War 1 – we bring you a timeline of the battle to date.  Nobel winner: The hunt for HIVAs a strange immune disorder threatened to reach epidemic proportions, virologist Luc Montagnier, a 2008 winner of the Nobel Medicine Prize, sought to uncover its cause.  Extrasolar explosionAround 290 extrasolar planets have been detected so far – but a massive new sky survey, starting later this year, could quadruple the tally of known alien worlds.  The platypus unravelledIt's been an enduring mystery since Western science 'discovered' it 200 years ago, but the publication of the platypus genome is now giving us an unprecedented insight into this perplexing hybrid of mammal and reptile.  The undo effectHappiness has a positive influence on longevity and health, but what's behind this effect? Psychologists are uncovering evidence that positive emotions undo the physical damage done by stress, fear and anxiety.  Fusion 2.0Fusion could one day generate limitless cheap energy from little more than water, while emitting no greenhouse gases. We look at its promise as the ultimate power panacea for a warming world.  A barcode for lifeSpecies scanners? An ambitious project to catalogue all life on Earth using DNA could revolutionise taxonomy.  The great Moon rushChina, Japan, India, Russia, and the U.S. are all sending satellites to the Moon, with landers, rovers and possibly astronauts hot on their heels. So why is the Moon such a draw?  UAVs find role in marine mammal surveillanceThis month a flying robot has been pressed into service off the coast of Australia to swoop low over the sea and carry out aerial surveys of endangered dugongs and whales.  The science of cosmeticsThe beauty industry makes some wild, and seemingly scientific, claims about anti-ageing products. But how do they hold up under the harsh light of science?  The real Sherlock HolmesWas Sherlock Holmes the original forensic scientist? Cosmos investigates the evidence.  The science of good and evilCognitive psychology, evolutionary biology and game theory are offering fresh insights into one of the most perplexing of human capacities: morality. Tim Dean explores the science. 
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