Part 2: Last year, we ran a pair of episodes that explored the greatest mysteries in our listeners’ lives - the big ones, little ones, and the ones in between. This year, we’re back on the hunt, tracking down answers to the big little questions swirling around our own heads. Today, we take a look at a strange human emotion, and investigate the mysteries lurking behind the trees, sounds, and furry friends in our lives.  This episode was reported by Tracie Hunte, Pat Walters, Molly Webster, Arianne Wack, Carter Hodge, Sarah Qari and Annie McEwen, and was produced by Matt Kielty, Tracie Hunte, Pat Walters, Molly Webster, Arianne Wack, Sarah Qari, Annie McEwen, and Simon Adler.  Special thanks to Yiyun Huang, lab manager at Yale's Canine Cognition Center. Check out Code Switch's "Dog Show!" Support Radiolab today at Radiolab.org/donate.