When levels are high, it suggests that bones need more calcium to grow.

CNN: Vitamin D deficiency common in U.S. children

In her first week at medical school she collects the box of human bones she will need for her anatomy studies, taking it to the pub so she can boast to everyone that she is a real trainee doctor.

ECONOMIST: A surgeon's life

And dense bones are something women really need to strive for, given our propensity towards brittle bones, or osteoporosis, especially as we age.

CNN: Stay wise about weight as you age

As with any bare-bones kit, you'll need to install your own memory, storage, wireless networking components and operating system.

ENGADGET

Do I need a medicine to strengthen my bones?

CNN: Multiple myeloma