LifeLife's other mystery: Why biology's building blocks are so lop-sidedMost molecules exist in mirror-image forms, and yet life prefers one over the other. How this bias began and why it persisted is one of the most baffling questions in biology – but now we have an answerFeatures
HumansUploading your brain will leave you exposed to software glitches Think a digital version of your mind will allow you to live forever? It might, but it will also open you up to software manipulation and server problems, says Annalee Newitz Comment