Emily Roebling was a working mother ahead of her time. Her father-in-law—a serious, humorless, severe man—was the visionary who designed the Brooklyn Bridge. Enlisted into service after her father-in-law was killed and her husband injured, she eventually was considered the bridge’s chief engineer. It took 14 years and the pretense that her husband was still in charge. Here’s how she defied naysayers who called the bridge a “wild experiment.”