On the second floor of Morgan State University's engineering building, Jacob Walker, 12, is putting the finishing touches on a ruler he's just created.
Not yet an actual ruler. One he's designing on the computer. He just needs to add his initials — then it's time to produce it on a 3-D printer.
Jacob starts seventh grade in the fall and has big dreams. Building this ruler is all part of the plan.
"When I was a child," he says, "I loved to play with Legos, and it inspired me to be an engineer when I get older."