The distress signal “CQD” was established.
Two years later, it was replaced by “SOS.”
Source
Galileo discovered the first three satellites of Jupiter.
The US celebrated the opening of the country's first railroad station in Baltimore.
A 57-year-old man received the first transplanted heart from a genetically modified pig.
Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
Italy used its current tri-colored flag for the first time.
