© 2021 WKSU
Public Radio News for Northeast Ohio
Play Live Radio
Next Up:
0:00
0:00
Available On Air Stations
Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for April 12, 2021

SalkatPitt.jpg
THE OWL
/
UNIVERSITY OF PITTSBURGH DIGITAL ARCHIVES
Jonas Salk at the University of Pittsburgh where he developed the first polio vaccine.

It was on this date in 1945 that President Franklin D. Roosevelt collapsed from a cerebral hemorrhage and died shortly thereafter. And it was on this date in 1955 that an announcement was made confirming the Salk polio vaccine to be safe and up to 90% effective.