A new study provides many new insights into the biology of the prehistoric gigantic shark megalodon (megatooth shark), which lived nearly worldwide 15–3.6 million years ago. Paleobiology professor ...

You can break a vertebra in your 60s or your 70s or beyond. And a vertebral fracture, yes, many of them kind of don't get diagnosed, but often, they are painful, not all of them, when they occur.