This doesn’t sound as odd as you’d think to a scientist! One of my scientist friends has actually spent 5 years studying the way we pee! This is how it goes. Our blood goes through our kidneys that filter all the things in our blood that our bodies do not need. This is like cleaning our blood and it is very important because the blood that goes to our brain and heart and other organs needs to be clean of toxins and other chemicals that are no good for us! Our wee is all that stuff that our kidneys pick up from our blood. This is stored in our bladder. When our bladder is full a signal is sent to our brain to tell us to go and empty it which is when we feel like we need to pee. The main toxin that makes up our urine is called ammonia!