Dr. Perri Klass

To many parasitic worms, we are the world. And the way they've evolved to live within us — without wiping us out — is stunning.

Do we become empathetic human beings by nature or nurture? Dr. Perri Klass, a primary care pediatrician, explored the topic in "Understanding How Children Develop Empathy," a recent a...

Sleepovers sound fun, but they can be challenging for parents. Perri Klass, author, pediatrician and contributor to the New York Times Science Times, discusses the hurdles.

Listeners, what are your tips and tricks for a successful sleepover?

A lot of people set their children in front of the television to watch educational videos and programming — from "Sesame Street" to "Baby Einstein" — with the hope that these shows will help their children to learn. But a new study out last week in the Archives of Pediatrics and Adolescent Medicine, says these videos don’t actually make kids smarter, and may in fact impede their learning.

New studies and rumors fly almost every week on what (allegedly) causes autism and what "cures" it. At the same time, autism studies (including the frequently-cited Wakefield study linking MMR vaccines to autism in 1998) occasionally get retracted. What's true and what's not? Dr. Perri Klass and Dr. Eileen Costello, pediatricians and co-authors of "Quirky Kids: Understanding and Helping Your Child Who Doesn't Fit In - When to Worry and When Not to Worry," distinguish autism facts from autism fiction.

"Time outs" and positive reinforcement have seemed like reasonable ways to discourage or encourage bad behavior in kids for decades. But an advocate for an approach called "unconditio...