Karl Landsteiner is the man who discovered the types of human blood. Learn more about him in this blog post from my #DidYouKnow series: https://jmnorthup.com/2020/05/did-you-know-karl-landsteiner.html
Learn about the history of World Blood Donor Day in this blog post and find great #BooksForTheHoliday: https://jmnorthup.com/2020/06/14/did-you-know-world-blood-donor-day/
J.M. NORTHUP 