Thanks for your comments and the added info. I never claimed that “Jazz Singer” was the first motion pic to be accompanied by sound — only that it was the first sync-dialogue “talkie.”

In January 1914, the premiere in New York City of the “Photo-Drama of Creation,” (during the era of silent movies) where an audience of 5,000 gathered at The Temple, a building on West 63rd Street. The “Photo-Drama of Creation” was a combination motion picture and slide presentation, synchronized with musical recordings and phonograph-record talks. It was about eight hours in length and was presented in four parts.

This was thirteen years before “The Jazz Singer,” in 1927.

According to someone, somewhere, the Parisien Lauset patented the first motion picture with sound on August 11, 1906.
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This was twenty-one years before “The Jazz Singer,” in 1927.

Personally, I would’ve thought that Mentalfloss.com would do a little fact-checking BEFORE publishing.