our Lungs, Bones and Nails!

Your Lungs, Bones and Nails!
Here are essentially three facts in one. First, your lungs are full of tiny blood vessels called capillaries. In both your lungs, there are 300,000 million capillaries and if you were to take all of these capillaries and lay them out end-to-end, they would stretch for 1,500 miles. Second, we can break our bones but our bones are actually quite strong. One block of bone the size of a matchbox can support the weight of nine tones, which is actually four times as much weight as concrete can hold. Third, your fingernails are constantly growing and if you lose a fingernail, it will take roughly half a year for the nail to grow back from the base to the tip.