Scientific facts to answer for some of ur Y's: Y are most eggs egg-shaped???

   In biological terms an egg is an organic covering, compartment/vessel in which an organism develops.

 By the term egg, the most common one we visualise is the chicken/duck egg which is white/brownish tint in color respectively. 
Now why is egg egg-shaped or it can be said as an irregular oval. Eggs are egg-shaped for several reasons

• First, it enables them to fit more snugly together in the nest as there are not any sharp ends, with smaller air spaces between them. This reduces heat loss and allows best use of the nest space.

• Second, if the eggs roll, it will roll in a circular path around the pointed end. This will reduce the danger of the egg rolling out of the nest. Moreover the strongest shape would be a sphere, but spherical eggs will roll away, and this will be unfortunate for birds that nest on cliffs.

           
         Most eggs will roll in a curved path, coming to rest with the sharper end pointing uphill. There is in fact a noticeable tendency for the eggs of cliff-nesting birds to deviate more from the spherical, and thus roll in tighter arc.

• Third, an egg shape is more comfortable for the bird while its laying, rather than a sphere or a cylinder. Other shapes have structurally weak points and edges. 
• Finally, another reason is that hen's eggs are ideal shape for fitting into egg cups and egg holders on the fridge door. :D No other shape would do.

       Here is an illustration by Adolphe Millot from Nouveau Larousse Illustré [1897-1904] showing the various kinds of birds eggs and the key can be found here  

                                                         
                Thats all folks, A Scientific fact thus explained.


                More to be continued................. :)