Take, for example, the Australopithecus ... The upper limb was longer than the lower limb, and the spine had curvatures similar to a human spine. Many specimens of this species have been unearthed.

This is an extract from Our Human Story, our newsletter about the revolution in archaeology. Sign up to receive it in your inbox every month. Whenever we think about the process of evolution ...

A 2015 report suggests that more than 80% of people with RA have some cervical spine involvement. Although pain in the lumbar spine, or low back, is not commonly a part of RA, it's associated with RA.