It's DNA Day, that day when we celebrate the 1953 publication of Francis Crick, James Watson, Maurice Wilkins, Rosalind Franklin, et al in the scientific journal Nature regarding the structure of DNA.
There were a number of subsequent declarations of the commemoration until 2003 when annual DNA Day celebrations began to be organized by the National Human Genome Research Institute (NHGRI) culminating in April 25 becoming declared "International DNA Day" and "World DNA Day" by several relevant groups.
So, in that intellectual rarefaction that arises from those mechanism of international recognition we finally have a regular day nailed down. HAPPY DNA DAY !