Today is Giving Tuesday. Founded by the 92nd Street Y in New York City in 2012 and propelled by social media, it’s now a global movement encouraging charitable donations and service.

At its core: “The idea that no act of giving is too small to make an impact,” one of the organization’s executives told The Times.

That same belief inspired Adolph S. Ochs, the publisher of The Times, to help a man in need on Christmas Day in 1911.

That encounter led Ochs to found the Neediest Cases Fund, our annual charity campaign. And more than a century later, we’re still sharing stories of people in need — and giving readers a way to help — throughout the holiday season.

After all, as one longtime donor summed it up: “We’re all in this together.”

Remy Tumin, a reporter for the 107th annual Neediest Cases campaign, wrote today’s Back Story.

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Editors’ note: The Nov. 1 Morning Briefing referred to an article about new research and methods for studying ocean temperatures that included a conclusion from a study about ocean warming that is now in doubt. The researchers are working to revise their study because of errors detected in their calculations, and it appears unlikely that they will be able to support their original conclusion that the oceans have warmed an average of 60 percent more per year than the current official estimates by the Intergovernmental Panel on Climate Change. An updated version of the article can be read here.

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