>and I always thought one egg+ one sperm = new entity
>your way of thinking would distroy the whole field of forensic science :-)
In
Time Enough for Love by Robert A. Heinlein, one individual is created that has 46 biological parents, each contributing one chromosome.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)