Given that the body of scientific knowledge continues to increase exponentially, many scientists use tools as "black boxes" without understanding how or why they work. This is especially true when scientists use statistics. Statistics is a branch of mathematics and as such I believe that the only way to understand it is to understand the derivation of its equations. I will try to explain those derivations especially when the equations are used in the biological and medical sciences. Statistics is a huge field and so, it is going to take me a while to write these chapters. If you have a particular area of statistics that you would like me to address please don't hesitate to reach out to me.