New Zealand golfer Lydia Ko became the youngest golfer to rank No. 1 in the world.
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Alvan Graham Clark discovered the white dwarf star Sirius B.
The United Kingdom left the European Union, also known as 'Brexit.'
The day after being appointed, Adolf Hitler called for new elections to ensure he would win majority votes.
The first-ever daytime soap opera, These Are My Children, aired on NBC.
'Family Guy' by Seth MacFarlane premiered on Fox.
