23 February
23 February
February 23 1954 – Dr. Jonas Salk’s polio vaccine is administered for the first time
On February 23, 1954, Dr. Jonas Salk’s polio vaccine was administered to the children from the Arsenal Elementary School in Pittsburgh, USA, kicking off a trial run of mass inoculations…
February 23 532 – Byzantine Emperor Justinian I Orders Construction of Hagia Sophia
Some 170 years after the first construction of a church on the Bosporus River, the Byzantine Emperor Justinian I ordered the construction of a third building on the site. Just…
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