It was on this date in 1879 that the first public demonstration of Thomas Edison's incandescent lightbulb took place in Menlo Park, NJ.
Mark's Almanac for December 31, 2021
![A photograph of Thomas Edison holding an incandescent lightbulb.](https://npr.brightspotcdn.com/dims4/default/07d0aae/2147483647/strip/true/crop/550x759+0+0/resize/880x1214!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Ff3%2Ff2%2Fb2e5406140859b798f561de5c29a%2Fthomas-edison-gluhbirne.jpg)
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