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Battle of Versinikia: The Bulgars led by Krum defeat the Byzantine army near Edirne. Emperor Michael I is forced to abdicate in favor of Leo V the Armenian.
A bomb explodes on a bus in the Pakistani city of Quetta, killing at least 25 people and wounding 22 others.
The Danish astronomer Ole Rømer presents the first quantitative measurements of the speed of light.
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