English: In January 2019, scientists described a previously unknown web of capillaries that pass through the bones of mice. Textbooks describe large veins and arteries jutting out the ends of bones, but this newly-described network of tunnels provide a faster route for blood cells produced in the bone marrow to enter the circulation. The research team also looked at human bones using a variety of methods: taking photos from patients undergoing surgery, conducting MRI scans of a healthy leg, and investigating extracted samples under a microscope—and revealed a similar, albeit less extensive, system of capillaries