In 1938, people hadn't even dreamed of DNA. So what we've become is kind of a history of adult developmental research by incorporating new measures. We put people into MRI scanners and show them happy images and sad images to see where their brains light up. I mean, all these things that now we do that we're never conceived of when the study began. But then we started audiotaping people and then videotaping people. And then measuring their cardiovascular reactions,. We'd stress them out and measure how quickly they calmed down after a stressor. We drew blood for DNA.

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