Reengineering Life is a series from OneZero about the astonishing ways genetic technology is changing humanity and the world around us.
On a sunny Tuesday in April, amid a global pandemic, a newborn calf took his first shaky steps in a barn outside Sacramento. Animal geneticist Alison Van Eenennaam and postdoctoral researcher Joey Owen, looked on in awe. This wasn’t just any bull calf. This animal had been gene edited so that he could eventually produce more male offspring than normal.