A 7years girl asked her sciece teacher;
girl;..Teacher can my mother get pregnancy?
Teacher;.How old she is?
Girl;40 years old!
Teacher:.She probably can.
Girl:..What about my sister?
Teacher:..How old she is?
Girl:..Twenty years old.
Teacher:..Yes she can.
Girl:..And what about me teacher,can i get pregnancy?
Teacher:..No,you are too young,7years girl can't get pregnancy.
Suddenly a little boy at the window shout "You see, i told you last evening do not worry you can't get pregancy".