Welcome to Change Reaction, the newest venture of National Geographic Magazine. I’m Dan Stone, your humble host. All of us here at the magazine and NationalGeographic.com are glad to have you.

Here’s the deal: We’re trying something new. For decades, you’ve told us, your grandparents have sent you our paper edition. You’ve seen the photos, read the stories. But one thing your grandparents probably didn’t teach you was that geography can be social, too. You can follow your favorite photographers on Instagram, and interact with some explorers on Twitter and Facebook as they cross the planet and find amazing new things.

Later this month, I’ll be starting an epic trip–and tweeting it, too. To