Chapter 4 Tricks It’s amazing when you travel a little deep in to the wonders happening within a human body . Let us assume, if we put a dot with a pen, what will be its size? we all came from that… can you believe it! Yes, we have to accept it .The human sperm is about half a dot size each one measures about 0.002 inch from head to tail. The female ovum is 0.1 mm in diameter that is about half a dot size. The mixture of these two will be a about a dot