“Five second rule!” her classmates shouted as they rushed to pick up some food they had dropped on the ground. At that moment, 10-year-old Isha Mehrotra knew what she wanted to do for the annual science fair. After scouring the internet with her father, Mehrotra learned how to culture bacteria from home, first tossing food on the floor of her kitchen and swabbing samples onto agar plates — her very first microbiology project. She remembers presenting the data to her peers, watching their faces fall as they realized how much…
