Because it is flexible. Think about it; the ribs protect both the lungs and the heart. If the ribs were solid bone all the way around then unless you constantly break your ribs you wouldn't be able to expand the cheat to breath. Additionally your lungs would constrict the heart to a degree that it would function properly.
Lipids are about 90% fat, and gradually give up triglycerides as they circulate through the capillaries.
70% of people in the UK have sensory loss...I'm guessing...
At SPF 23 the sunscreen start to interfere with vitamin D.
