Students in a Napa, Calif., elementary school apply newly learned tech skills to projects that give voice to an entire community.

An after-school space where disenfranchised youth in a tough Baltimore neighborhood use science, technology, math and engineering leads a 7th grader to sponsorship and mentorship to build a potentially industry-changing sensor-enabled wheelchair.

Entrepreneur Elon Musk hosts a worldwide competition for students to design, build and run a high-speed train based on his own concept; students from six different schools work together for more than a year to bring the concept to life.

A neurobiology graduate student works to fulfill his childhood dream of bringing state-of-the-art prosthetics -- made with parts costing less than $50 -- to the third world.