Friendship rules! Friends help us work through problems, keep us company and bring joy to our lives. Making friends might have also helped our prehistoric ancestors survive and thrive! Still, friendship can be tough sometimes. In this episode, we’ll answer your friendship questions with Eileen Kennedy-Moore (a.k.a Dr. Friendtastic!) and hear some advice from a filmmaker with autism about making friends. Plus an all-new Mystery Sound! This episode was sponsored by: Indeed (<a href="http://indeed.com/BRAINS" class="c-link">Indeed.com/BRAINS</a> - Terms and conditions apply. Cost per application pricing not available for everyone.) ***** Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

Why do dogs wag their tails?

Brains On!® is a science podcast for curious kids and adults from American Public Media. Each week, a different kid co-host joins Molly Bloom to find answers to fascinating questions about the world sent in by listeners. Like, do dogs know they’re dogs? Or, why do feet stink? Plus, we have mystery sounds for you to guess, songs for you to dance to, and lots of facts -- all checked by experts.