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 Cosmos Online The many worlds of Arthur C. ClarkeHe was many things - an engineer, a thinker, a novelist. But Arthur C. Clarke was most of all a visionary who had an incalculable influence on space travel, space exploration, and astrobiology.  Enzymes made to orderIn a world first, scientists have managed to synthesise entirely new functional enzymes that could pave the way to reactions not seen in the natural world.  Let's use seaweed as fuelThe environmental and social costs of producing biofuels on land can be avoided by farming seaweed, says Ricardo Radulovich.  Becoming immortalWithin a few decades, we might reasonably expect to have extended life to 150 years or more – the first human to live to 1,000 may have already been born. But, does death give meaning to our lives? Where do we go from here?  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.  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 missing link in Australian genomicsGiven top billing on the cover of Nature, the first Australian animal to be sequenced should have been a triumph for Australian science – but the majority was done overseas. Why did we miss the bus?  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.  The key to innovationWhether you're digging a ditch or designing an aeroplane, innovation makes the task more efficient and competitive. So how do we drive innovation?  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? 
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