A special thanks to Wikipedia.org for following historical information. The sermons I have chosen from Sermonaudio.com
532 – Byzantine emperor Justinian I lays the foundation stone of a new Orthodox Christian basilica in Constantinople – the Hagia Sophia.[2]
Recommended sermons and podcasts: Turkey Turns Hagia Sophia into a Mosque, by Various Speakers/Theology central
1954 – The first mass inoculation of children against polio with the Salk vaccine begins in Pittsburgh.
Note: Up until COVID I have always been very Pro-vaccine. For a good lecture by a qualified medical professional on vaccines in general, please listen to The Vaccine Wars, by Richard Holdeman, Ph.D. Here is a short excerpt from this lecture:
"Next to clean water, vaccinations have saved more lives than anything else in history." Dr. Holdeman has a Ph.D. in Cell and Molecular biology.