The fathers weren't supposed to matter. But in the mid-1960s, pharmacologist Gladys Friedler was making all sorts of strange findings. She discovered that when she gave morphine to female rats, it altered the development of their future offspring — rat pups that hadn't even been conceived yet. What's more, even these rats' grandchildren seemed to have problems. In an effort to understand the unexpected result, she made a fateful decision: She would see what happened when she put male rodents on the opiate. So she shot up the rat daddies with morphine, waited a few days, and then mated them ... Read More