It might not be popular as it’s not an official international day, but today, 7th of February, is periodic table day.
There’s always geeks celebrating whatever they obsess over. The National Periodic Table Day Foundation was created with quite a transparent objective. They chose the 7th of February because on that day John Newlands—who invented the periods of the periodic table—published what they consider the first periodic table ever.
On the home page of their web site, the history of the table is told through the contributions of nine (male) chemists. If you prefer a shorter and lighter version of it, revisit my old ramblings about the periodic table.
The celebration this year is specially relevant as a few months ago the four missing elements of period eight were added to the table with their new official names and symbols. Moreover, I took part in the making of a new interactive and fully up-to-date periodic table published last November, which I am very proud of.
Happy Periodic Table Day!