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Quantum theory is 100 years old and still going strong. Combininggeneral relativity with quantum mechanics is the last hurdle to be overcomein the 'quantum revolution'.
The p53 tumour-suppressor gene integrates numerous signals that control cell life and death. As when a highly connected node in the Internet breaks down, the disruption of p53 has severe consequences.
Studies of stem cells will help in understanding the development and function of organs in mammals. They may also offer a way of treating diseases ranging from liver failure to Parkinson's disease.
