Do you ever get a door wrong? You pull when you should push, or you push when you should pull? Don't worry, it's not just you that's getting a door wrong. Vox's Joe Posner speaks with design expert Don Norman author of "The Design of Everyday Things," on how good design can guide you through your everyday life. When undertaking your next remodeling project, be sure to design a door that speaks for itself.

To find out all about crappy door design, watch the video below.

And the "human-centered design" revolution he sparked changed not only how designers work, but also how people in fields like public health work to make the world a better place. This is why Melinda Gates believes human-centered design is one change that could save the world.

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