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Barcode your egg and sperm cells to avoid IVF mix-ups
A tiny polysilicon tag can label both eggs and semen, reducing the risk of sample mistakes in the labs of fertility clinics

Young blood helps repair fractured bones of ageing mice
Youthful blood has once again shown its promise as an elixir of youth – this time helping to rejuvenate bones. But exactly how it does so is still to be unravelled

Your brain’s unique response to words can reveal your identity
Reading a list of words provokes brain activity unique to an individual. This could lead to a more secure alternative to fingerprint recognition or iris scans

Mixed Messages: Are our genes and culture at cross purposes?
Why privilege genes over culture when people like South America’s Mbaya, who eschew sex and pass on their culture through adoption, seem to argue the opposite?

2 ºC warming goal shaky as governments throw cash at fossil fuel
Shell is said to be preparing for a 4 ºC warmer world future, while governments keep subsidising fossil fuels with $5.3 trillion a year globally

Everyday drugs: What’s the latest on aspirin?
First they said everyone should take it. Then they said healthy people shouldn’t. Now it seems to protect against cancer. Here’s how to weigh up the risks