Scientists have filmed what happened when they presented lab mice with an anaesthetised and unresponsive cage mate. They were found to paw at, bite, and pull the tongues of their comatose friends. The researchers identified the brain regions that are crucial for this behaviour | The i paper

Most lab mice are kept in pristine conditions, but a few immunologists think a dose of dirt could make them a better model of human disease... Read more: https://go.nature.com/2ESiC0U | Nature