Just 10 people out of 5000 surveyed after the meltdown at the Fukushima Daiichi nuclear reactor in March showed unusually high levels of radiation

All today's stories on newscientist.com, including: how much meat an eco-citizen can eat and virtual rioters predict how crowds move

See a new simulation of group behaviour that could help with disaster relief

Columbines evolved a spectacular variety of petal shapes to attract different species of birds and bees

A brain-based design for microchips that are both cooled and powered by fluid could one day put a supercomputer in your pocket (full text available to subscribers)

Quantum oddities could help explain how chemical reactions get started in the freezing near-vacuum of interstellar space (full text available to subscribers)

Curious features on Jupiter's icy moon Europa show where liquid water once appeared close to the surface, making them intriguing targets for alien hunters

A new type of sensor can track movement not only in heart muscles, but also muscles in the lungs, limbs and eyes

Listen to the sound of a lathe and marvel at a toaster-sized earthquake at an exhibition that crosses the boundaries between senses

As London's Natural History Museum takes delivery of two replica fossils, palaeontologists hint that they have mummified skin

A simple card game reveals how much visual information we take in unawares, suggesting how gut instinct works

Fears of leaks prompt US government to launch environmental review of Keystone XL pipeline route through Nebraska's sand hills (full text available to subscribers)

Social networks are the next stop in the search for clues to offline crime such as burglary

It may seem obvious, but negotiating cuts in emissions while building fossil-fuel power stations just won't work

The Australian government has paid asylum seekers A$23 million to compensate for unlawful detention or psychological and physical injury

A new era of flexible robots has arrived, and it challenges our notions of what it means to be intelligent, says Justin Mullins (full text available to subscribers)

Anne Johnson, founder of the UK's National Survey of Sexual Attitudes and Lifestyles, explains the best way to find the truth about our intimate secrets (full text available to subscribers)

The new bridge across San Francisco bay, the largest of its kind ever built, must be able to sway to withstand a big earthquake – and one is expected soon

The tracking of suspects by police is being pitted against civil liberties in the US Supreme Court and the outcome is far from obvious

We all know we need to eat less meat – here are the hard numbers