Your body is amazing.

your body is amazing did you know that laid end to end the Airways in your lungs spanned 2,400 

kilometers in length which is a quarter of the length of the Great Wall of China or that the nails on your dominant hand grow slightly faster.
Hear someone voice thank the three bones in your ear that are so small they could all fit on a single penny without them you wouldn't hear anything or be able to balance this includes the smallest bone in your body  but stay piece while the longest and strongest is your femur found in your thigh stronger than steel and four times stronger than concrete.
As an adult you only have 206 bones but as a baby you had 300 but they weren't so much as lost as simply fused together.
your lungs are capable of inhaling 13 liters of air every minute for a total of 8,000 to 9,000 liters daily.
Now breathe out hard no matter how much you push there's always one liter of air left in your lungs similarly your stomach is never fully empty always containing a fifth of a cup of hydrochloric acid 
The hypothalamus in your brain maintains an optimal body temperature of 37 degrees Celsius and works with the skin sweat glands and blood vessels to maintain this temperature when the external temperature is hot the blood vessels dilate in an effort to help release more heat and sweat glands sweat so the evaporation cools off your skin when the external temperature is cold the blood vessels constrict so blood flow is prioritized for the vital organs. some might say that the liver is the hardest working organ in the entire body with over 300 functions to carry out on a near daily basis considering its importance it's no wonder that the largest internal organ in your body is the only one capable of regenerating completely this jack-of-all-trades filters everything that we eat and drink including alcohol and drugs converts glucose into glycogen for storage produces bile which helps digestion and even stores iron in the form of ferritin .
Your lungs and kidneys work together to maintain and regulate an optimal blood pH of 7.4 if pH is higher than 7.8 or lower than 6.8 the result is usually death when pH Rises the kidneys excrete excess bicarbonate ions and the lungs try to conserve carbon oxide when pH drops the lungs work to remove more carbon dioxide and the kidneys looks read more hydrogen ions even though you have two kidneys each of which is no larger than a computer mouse you can survive with only one functioning at 75% inside each lies a network of 1 to 2 million nephrons which are tiny filters capable of filtering from 110 to 140 liters of blood per hour meaning all the blood in your body is filtered through the kidneys 400 times throughout the day an adult has 5 litres of blood at any given time which makes up 7 percent of our entire body weight .
Of course your blood is full of red blood cells right now there are 25 trillion of them coursing through a mind-boggling 100 thousand kilometer network of blood vessels every second 2 million red blood cells die via filtering from your spleen but don't worry your bone marrow is generating 2 million every second to replace them.
Your hair is the second fastest growing part of your body capable of growing 6 inches per year though there is variation across populations with male hair tending to grow faster than female hair.
As a newborn your lungs were filled with fluid approximately 10 seconds after birth you sharply inhaled as a response to the new environment and your breathing process that sustains your life began.