When the only two other girls in Rebecca Wang’s high school computer science class were absent, she felt uncomfortable.  “It’s not that the boys weren’t welcoming to me,” she said. “It was more that I didn’t see other girls in the classroom.” Rebecca, a 17-year-old from San Jose, California, decided to do something about it....

When Rory Hu came across a news article about the global decline in honey bee populations, she was inspired to do something about it. Known as Colony Collapse Disorder, it puts the global food supply at serious risk. The teen from San Jose, California, dug deeper, discovering in her research that harmful pesticides can damage...