The distress signal “CQD” was established.
Two years later, it was replaced by “SOS.”
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Italy used its current tri-colored flag for the first time.
The first telephone call was made across the Atlantic – from London to New York.
Galileo discovered the first three satellites of Jupiter.
The Sahara desert was blanketed in snow.
President Truman announced to the people of America that they successfully developed a hydrogen bomb.
