Four new portraits have gone up at the Smithsonian National Portrait Gallery, showcasing this year’s recipients of the Portrait of a Nation award for their transformative contributions to American history and culture. One of them is Temple Grandin, who has transformed animal welfare around the world and affected public perception of autism. John Yang speaks with Grandin for our Weekend Spotlight. //

Right now one of the big things I've been working on is recognizing the importance of object visualizers. And I'm worried about them getting screened out. Okay. I went up to community college and they're doing a two year factory maintenance degree and requiring calculus and algebra. Well, you're going to screen out the very best mechanic for keeping a factory running. //

I just talked to a science teacher and her dad was cooking. Airplane mechanic couldn't do any, any higher math. He fixed some hydraulic problem on a Boeing airplane and Boeing put it in every one of their airplanes because he could just see how the hydraulics works. We need these thinkers.

Now where we need our mathematical engineers. Let's take something like a spaceship. The mathematician tells the thruster when to thrust, but the visual thinker has to make sure it's put together properly.

You see, there's two parts of engineering here, the mathematical part and what I call the clever engineers that often don't get enough credit.