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 Cosmos Online Solar sailingSolar sails would allow a spacecraft to be propelled by the gentle pressure of light itself. It sounds like a fantastical concept, but with two missions imminently due to practically test the idea, it's edging towards reality.  The profit from obesityTo stem the spread of obesity, we must study the complex web of commercial interests and marketing strategies driving it.  Mapping the evolution of the cosmosA new telescope in the Australian outback, promises to answer big questions about the history and fate of the cosmos. By focusing on distant objects, it will peer back in time, almost to the Big Bang 13.7 billion years ago.  Who’s afraid of the big bad toad?A new arsenal of weapons, such as toad-specific parasites and pheromones is giving a glimmer of hope in the toad wars.  Bird flu: A dead duck?Health officials warned of a major bird flu pandemic ripping across the world as early as 2004. But it still hasn't happened. Was it scaremongering? Statisticians pick over the evidence.  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.  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. 
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