This summer, as salmon swimming up the Katmai National Park's Brooks Falls became an all-you-can-eat buffet for bears, more than 15 million people watched via explore.org, which runs live-streaming webcams in nature settings around the world. Conor Knighton talks with the site's founder Charlie Annenberg Weingarten, who says the portals into nature provide viewers with an "antidote to stress."

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