Catherine Yeo was three years old when she discovered Sudoku puzzles at the back of magazines and newspapers. She would compete against her mother to see who could fill in the empty cells fastest, often beating her speed. Soon enough she became hooked on recognizing patterns and solving problems, fueling an interest in math and technology. Now, when the 16-year-old from San Jose isn’t leading PixelHacks, a 24-hour hackathon geared towards female high school students, she’s using the intel she gleaned from an Apple World Wide Developers Conference (WWDC) scholarship to continue to change the world through tech.