10/06/2026
Czech physician Jan Janský changed modern medicine with a discovery that still saves millions of lives today. In 1907, he classified the four main human blood groups, laying the foundation for safe blood transfusions around the world.
On Blood Donor Day, celebrated on June 14th, we remember not only his scientific contribution, but also the importance of every person who chooses to donate blood.
Thank you to all blood donors. ❤️