Sgt. Tibbs, a beloved 19-year-old cat, goes missing on the streets of Manchester, New Hampshire. His owner fears the worst. But when she finds out her cat was never missing at all, the truth turns out to be worse than she feared.

In County Leitrim, an area of Ireland hit hard by the Troubles and the Great Famine, townspeople are fighting what they say is a new wave of colonialism: Sitka spruce plantations.

We sing along at concerts. We chant at protests. We belt it out at birthday parties. Why do humans sing together?

In this special collaboration between Outside/In and Tumble Media, we answer a serious question about silly behavior: “Why do some animals play, and some animals don’t?”