The more we know about the animals that lived during this time, the more we can start to comprehend how species react and recover after an extinction event.
The team found evidence of about 50 lions that had been injured or killed by porcupines since the 17th century.
Museums' collections are a priceless resource for scientists, but they're not easy to access. Digitizing specimens – like the 700 bat skulls the author studied – is a way to let everyone in.
There are many different types of medical imaging and they all pick up different things.
X-rays are like light rays, but they can pass through more stuff. Some of the x-ray's energy is blocked by bone, which is why you can see bones so clearly on x-ray scans.
In a recent study of almost 11 million young Australians, we showed those exposed to a CT scan before the age of 20 had a small increase in cancer risk in the years after exposure.
Reducing health-care waste relating to unnecessary tests has been a major priority for researchers, governments and health services for decades. But how do we change the behaviour of doctors?