Maykah builds girls' interest in science Not too many semesters ago, Bettina Chen, Alice Brooks and Jennifer Kessler were taking college courses such as linear algebra, electromagnetic engineering and the fundamentals of advanced energy conversion. [...] at Stanford University, the three women have teamed up to form Maykah, a startup aiming to create toys that encourage young girls to study science, technology, engineering and math. All three founders trace their passion for technology back to their childhood playthings. Though women hold 56 percent of all professional jobs in the United States, they make up only 25 percent of the tech industry's workforce, according to the National Center for Women & Information Technology, a nonprofit. Walk down the toy aisle at most stores, and the gender divide is evident. By high school, only 19 percent of the students taking advanced placement computer science tests are female. "Just the picture or the way it's packaged, it makes it clear to parents who is expected to play with the toy," said Linda Kekelis, executive director of Techbridge, a nonprofit in Oakland that offers science and technology after-school classes and summer camps for girls from fifth to 12th grades. Oakland nonprofit offers science and technology after-school and summer programs for girls from fifth grade to 12th grade.