For almost three decades Calvin College professor Pete Tigchelaar (left) has had a three-month-old fetus, encased in plastic, that he uses in his human biology classes.He's always thought of the tiny fetus as a good educational tool. But he's not thought of it as a lifesaver.Last year, however, that changed when a student in one of his biology classes privately inquired if he still had it.Intrigued Tigchelaar said that he did and invited the young woman to his office for further conversation. There he asked why she was interested. She proceeded to tell him an amazing story, one that...