That self-tightening shoe you saw on "Good Morning America" was only inspired by the time-traveling '80s classic "Back to the Future 2." Developed by amateur tinkerer Blake Bevin, the Power Laces ...

Developed by amateur tinkerer Blake Bevin, the Power Laces Shoe (version 2.5) was inspired by the classic '80s movie and was created in less than five months, with no formal electronics training.