Pope Leo II became the bishop of Rome.
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American swimmer Michael Phelps became the first person to win eight gold medals at one Olympic Games.
A tropical cyclone hurricane hit Galveston in Texas.
Asaph Hall discovered Mars' second moon, called Phobos.
Solymon Merrick patented the wrench tool.
Younes Abouyaaqoub drove a van into pedestrians on La Rambla in Barcelona, Spain, killing 14 people and injuring at least 130 others.
