The DNA week was a unique week during which students, teachers and the public could learn more about genetics. The official International DNA Day is April 25th, commemorating the discovery of the double-stranded DNA structure in 1953 and the end of the human genome project in April 2003. The pilot year of this event was held in 2003 in Slovakia on the occasion of the 50th anniversary of the emergence of the DNA structure. Last week we remembered the 65th anniversary of this discovery in Bratislava, Košice, Prešov and Nitra.