MORE FROM NEW SCIENTIST
Cockatoos understand when a job requires a toolkit
Goffin’s cockatoos know when they need to bring more than one tool to retrieve some food – something only chimpanzees have demonstrated before among non-human animals
The 2000-watt energy saving challenge may be hard, but it’s worthwhile
A Swiss vision of a low-energy society set a goal that is irresistibly simple: consume energy at a rate of just 2000 watts. It’s a great way to push us to use less power - good for the purse and the planet
2000-watt challenge: How to reduce your energy use and still live well
In theory, it’s possible to live well while using energy at a rate of just 2000 watts – a quarter of the average for people in the US. Our environment reporter took on the challenge. Here’s what he discovered
Tweets reveal hardware stores cause disgust but hostels bring joy
A study of nearly 2 million tweets over one year suggests that people in San Francisco feel disgusted when at hardware stores and Londoners are most joyful at hostels or motels