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 Features Crocodile's diet may be key to survivalCrocodiles may have survived millenia, but they're facing threats from climate change to cane toads. A thorough understanding of their diet may be necessary to help them survive.  Tipping point?Are we approaching a juncture where technology will accelerate exponentially and we'll merge with machines? We review the radical concept of the singularity.  We are the robotsA powerful artificial intelligence won't spring from a sudden technological 'big bang', it's already evolving symbiotically along with us.  Mystery of missing sunspots solvedThe Sun is in the pits of a century-class solar minimum, and sunspots have been puzzlingly scarce for several years. Now, solar physicists think they understand why.  Black harvest: the battle against wheat rustA global scourge is spreading that could devastate food supplies. To fix the crisis comes Norman Borlaug, the man who saved the world before ... and needs to again.  Cosmic collisionsThere's a suspicion among scientists that, not only may we be able to detect parallel universes, but that they may occasionally collide with our own universe.  Preparing for doomsdayClimate change, resurgent diseases and a growing population are all having an impact on global food security. It's an important nut to crack – and part of the solution is a vast library of seeds.  Sacred stones: unravelling StonehengeStonehenge is one of the world's best known monuments. But why it was built remains a riddle – one that the first archaeological dig in 40 years sought to solve.  Ice world: the catalyst for life?800 million years ago, a dramatic climatic lurch may have left our planet entombed in ice. But this snowball Earth could also have been the catalyst for complex life.  Nuclear power on the MoonWhen NASA astronauts set up the first manned outpost on the Moon, they may well pack a kilogram of uranium to take along with them.  The Hubble telescope: a time machine that revolutionised astronomyThe Hubble Space Telescope, the object of NASA's fifth and final servicing mission this week, has revolutionised our view and understanding of the universe.  A brief guide to cosmologyConfused by inflation and the CMB? Perplexed by dark energy and dark matter? Want to know what happened after the Big Bang? Then read on to learn how it all fits together.  Survival of the human speciesAlmost all of the species that have ever lived are now extinct. Could we be next?  Civilisations: why they failEven great and powerful civilisations have fallen because of choices they made to ignore their impact on the environment.  Children of MarsHow did astronomer Paul Davies come to propose that life arose on Mars and then seeded the Earth? Here he elucidates a theory that could offer us insights into the nature and origins of life. 
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