Journey of human developmental biology is a tremendous story narrated by an old researcher to an young aspiring boy who has no idea about the human origin and development. It goes like this.............

Researcher: Why you waste your time in nothing, time is precious and
                      valuable, once you loose it you cannot get it back.

Young Boy:  What no!! Till today I thought money, gold, house and car
                     are the most precious things in the life. And other things has no
                     value, And that's what my parents discuss about all the time.
                     And they never discussed about time.

Researcher: hahahaha.....!! I can understand your situation. (Researcher
                      talks to himself ohh young brains are like blank Canvas, A good
                      Artist should initiate to use it and draw wonderful monuments
                      out of it)

Young Boy:  What ? What did you say just now !!! young brains are like blank
                     Canvas, A good Artist should initiate to use it and draw
                     wonderful monuments out of it. Ha....hmmm In that case I will
                     be your empty canvas and will you be able to draw a wonderful
                     monument out of me.

                     I mean to say will you be that good artist ??

Researcher: Hmmm,,,, you little rascal !!! why not Sure hahahaha.........

 Young Boy : Okkk.... You are telling me about the value of time till now ..
                       But what did you do in your life to save this time. How did you
                       utilize it..?

Researcher: Ohhh !!!! good question.  Hmmm in my whole life I was running
                     behind to reveal the secrets of human origin and development.

Young Boy:  Human Origin and development ???? what ?

Researcher:  Answer this question, Tell me about your origin ?

Young Boy: My Origin? my origin is from my mother's womb.

Researcher: Good. Tell me when you took birth?

Young Boy:  August 10th year 2005

Researcher: Do you know where were you before this time ?

Young Boy: hmmmmmm.............. I don't know.

Researcher: See this image below... You were sliding in your mothers womb
                        like this in your ninth month.
                                



Young Boy:  Ohhh Interesting !!! can you please show me the 8th, 7th,
                      6th,5th month images. Please............

Researcher: Sure, why not, you little rascal....


                                      

     

  
Researcher: Hmmm.... What did you observe from these images you little
                        rascal... ha ?

Young Boy:  Ya.. I was constantly growing and along with that size my
                       mothers womb is also increasing.

Researcher:  Good you noticed that.

Young Boy: O.K now I want to see my 1 months image, infact 1st days Image.

Researcher:  Then see this image...

                                         


                   
Young Boy: Ohhh... no!! I look like lizard and I have tail too...

Researcher:  hahaha... Yes! you are right. See this two images also.....


                           

Young Boy:  I am slowly bulging out.
                      And see see.... slowly body parts are getting differentiated.

Researcher: Yes, yes my little rascal.... you are absolutely right.

Researcher: Now you notice this image and tell me what you notice.

                 

Young Boy: Ohh you have given me comparative chart of different organisms
                     In the first stage of development all the organisms look same
                     with tails, apart from fish and salamander all the other
                     organisms look similar.
                     The actual changes are seen in the third stage.

Researcher: Absolutely right ! but those are not stages they are called as
                        Trimesters, (I, II and III Trimester).
                        Do you know development of every organism starts from the
                        union of two cells i.e., Egg and Sperm cells. Which further
                        gives rise to a Whole organism.

Young Boy:  Is it.., quite Interesting. So how many cells are there in our
                       body ?
Researcher: There are millions of cells in our body. See this image it can tell
                        you how a zygote give rise to a complete human.