Students from 20 different public high school across Brooklyn came together at the Brooklyn Army Terminal to show their solutions to social issues.

The event is known as the ‘Aspen Challenge’ and was founded by Jeff Bezos’ parents, and the only other one happening in the country is in San Diego.

Students attended a forum in February and then were given eight weeks to choose a local issue that’s important to them, come up with a solution, develop it in their community and then show it to an esteemed panel of judges from the education, media and finance industries.

The team from the High School for Enterprise and Technology focused on the city’s rat problem, while Williamsburg Prep students came up with a program to educate people about hydroponics and how it can make produce more affordable and accessible.

The judges will choose multiple winners. Those winners get a trip to Colorado to present their plan at the Aspen Ideas Festival.