GoldieBlox, the engineering toy company for girls whose promotional video went viral last year, will have its own balloon in this year’s Macy’s Thanksgiving Day Parade. “The Girl-Power Spinning Machine,” which is designed to showcase engineering principles, will float down the streets of New York City alongside beloved floats like Snoopy, Garfield and Spider-Man. Debbie Sterling, CEO of the company, has long had a mission to close the gender gap in the STEM fields (science, technology, engineering and math).