Now in its third year, President Barack Obama will host the annual White House Science Fair that celebrates the achievements of young high school and college students who entered and won various science, technology, engineering, and math (STEM) competitions nationwide.

The fair will feature ingenious creations, such as a manually operated water sanitation system, a mobile app that helps babysitters and nannies care for young ones, and more.

Among the winners are 18-year-old Kiona Elliot from Oakland Park, Fla., who worked alongside classmate Payton Karr, 16, to invent a bicycle pedal-powered water filtration system.