Before we break for the holidays, The Big Story team decided to try to end our year on a positive note with a week of good news stories. We hope this week brings you hope, light and laughter. It might be our job to often deliver bad news, but that doesn't mean that's all the world is.

Coral is disappearing across the world. As much as 50 percent of it is gone. But technology we've been working on for decades is beginning to pay off, allowing us to thaw cryogenically preserved coral and mature it to adulthood. It won't fix everything overnight, but it's a major breakthrough for our hopes of regrowing the reefs we've lost, and preserving other sorts of vanishing biology.

GUEST: Brent Foster, independent science writer, in Hakai Magazine

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