The pair each won $25,000 scholarships and internships at Google and LEGO.
The international panel of judges included what Google described as “a panel of acclaimed scientists including Nobel Laureates, tech visionaries and household names.”
The trio were selected from a pool of 7,500 entries coming from 91 different countries.
“We are humbled by your ingenuity, your dedication and your skill. We are heartened to know that our future is in the capable hands of our young scientists–young men and women who tackle big ideas to bring significant, actionable change to the world,” Google said.
The science fair was the first such project launched by Google, and was announced in January.