How should we do research on human nature?

Iris Berent in the Los Angeles Times:

Parenting can make you wonder about human nature. If you have kids, you might have noticed their differences early on. When my infant son first heard music, his eyes grew big, and his gaze got intense. My infant daughter was clearly the people person. At 3 months, she was using her single tooth to mischievously bite me and watch my reaction. No wonder my son became a composer and my daughter turned to psychology.

Were they born this way? Does nature shape who we are? Since the advent of cognitive science, neuroscience and behavioral genetics, this age-old question has become the topic of intense scientific research. But in the current social and political climate, the concern with human nature has become dangerously loaded.

More here.