1. The Brain is the part of the body's nervous System. The Brain,spinal cord and nerves makes up our nervous system. 2. We use our brain 100%. Almost every part of the brain in active at some time. Only thing,we may not use our whole brain all at once,but we do use them fully. 3.Our brain creates connections or pathways between 100 billion of microscopic cells called Neurons.They are nerve cells that carry messages back and forth between our brain and body. "When you sit in the same position for 15-30 minutes,may lost feeling in the feet with heavy foot unable to stand and pain".This is because nerves run through all your body and temporarily squash your nerves in that area.So the nerves in that area can't send messages back to the brain normally,and you feel a pain.Again when you stand up,the nerves are not compressed,pain last for seconds and your foot will comes to normal. 4.The brain stem is located at the base of the brain,connecting to the spinal cord