Panthera leo’s family tree takes shape

Once upon a time, lions were the world’s most widespread mammals. Now we know more about their genealogy – and that could make it easier to help the species survive.

Instagram makes it easier to exercise

People who followed researchers’ motivational posts on Instagram got more enjoyment out of their training sessions. Just a couple of minutes over the course of four weeks was enough to make a difference.

State’s large investments smarter than many people think

From the press coverage, you might expect only wasted time and projects built over budget when the government invests in roads, buildings and other large projects. But the state — in Norway, anyway — doesn’t do a bad job after all.

Lithium can now be recycled

Lithium from Norwegian electric car batteries isn’t recycled that often. Instead, it ends up as waste when other metals it’s mixed with are recycled. But this may change.

People who need health care advice the most like it the least

Most people think it’s a good thing that public health authorities propose preventive health measures. The greatest resistance is found among individuals who need these measures the most – such as smokers, people with unhealthy diets or who don’t exercise.

How cancer breaks down your muscles

A solid tumour can cause muscle cells in the body to self-destruct. Many cancer patients die from the consequences. Now researchers are discovering more about how cancer cells in a tumour can take control of muscle cell wasting and trigger a chronic, serious condition.

Predicted skewed waves – and found them

He solved a 127-year-old physics problem on paper and proved that off-centred boat wakes could exist. Five years later, practical experiments proved him right.