Elon Musk bought a 9.2% stake in Twitter, amounting to $2.9 billion.
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Beyoncé and Jay-Z married with only 40 guests present on their special day.
US Congress released a US flag that featured 20 stars and 13 red and white stripes.
NASA's Challenger Space Shuttle was launched from Florida on its maiden voyage.
New York City's Twin Tower World Trade Center was officially opened.
Martin Luther King Jr. was assassinated.
