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Nature editor Olive Heffernan reports on the organizational disaster that has left hundreds of registered delegates excluded from the UN negotiations on climate change. As talks on a climate deal heated up at the Bella Centre in Copenhagen, over capacity left many stranded for hours outside in the cold as they awaited a decision from UN Officials.

Science Foo Camp is a very unusual kind of conference. Held each summer at Google's headquarters in California, this gathering of geeks is informal and unstructured; there's no agenda until the first evening when the attendees collectively create one. Nature's Charlotte Stoddart went along to Sci Foo 2009 to capture its unique spirit on film.

James Lovelock is best known as the father of Gaia theory; the idea that all parts of our planet form a complex interacting system, like a single organism. His new book depicts Gaia in trouble. In this interview Lovelock sounds a final warning for planet earth and enthuses about his upcoming space trip.

In December, policy makers will meet in Copenhagen, Denmark to thrash out a new global deal on climate change. The aim is to limit global warming to two degrees Celsius above pre-industrial temperatures. We sent three young climate researchers along with Nature's Olive Heffernan to find out just how much of a challenge this ambitious target will be. Join them as they seek advice from climate experts including the IPCC's Rajendra Pachauri, challenge the sceptical views of political scientist Bjørn Lomborg, and learn lessons from the Nobel Laureates who showed that CFCs were destroying the ozone layer.

This short film was made at the 2009 Lindau Meeting of Nobel Laureates in Germany.

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British broadcaster Sir David Attenborough talks to Nature about his obsession with birds of paradise.

David Attenborough: Scientist or Broadcaster?

Nature Methods has selected induced pluripotent stem (iPS) cells as its Method of the Year 2009. Now that the generation of iPS cells is becoming routine, researchers can use them as a tool to make discoveries in disease and basic biology. Get the free Nature Methods special feature here: http://www.nature.com/nmeth/focus/moy...

New interpretations of the Antikythera Mechanism reveal that it could be used to predict eclipses, and that it had a dial recording the dates of the ancient Olympiads. The 2,000-year-old box of intricate gearwork provides a glimpse of the engineering prowess of the Hellenic world. The team discuss their results here.

We're half way through the second week of talks in Copenhagen where 193 nations are trying to agree a global deal to avoid catastrophic climate change. Nature's Olive Heffernan caught up with renowned climatologist Stephen Schneider, who says that staying well below 2 degrees of warming is unrealistic.