American swimmer Michael Phelps became the first person to win eight gold medals at one Olympic Games.
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Asaph Hall discovered Mars' second moon, called Phobos.
Three Americans made the first successful Atlantic Ocean crossing by hot air balloon.
King Charles IX of France became an adult on his 13th birthday.
Younes Abouyaaqoub drove a van into pedestrians on La Rambla in Barcelona, Spain, killing 14 people and injuring at least 130 others.
William B. Purvis patented the electric switch on railways that would shut off the electric supply after carriages pass the contact device.
