Finland officially joined NATO, becoming the 31st member of the security alliance.
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Beyoncé and Jay-Z married with only 40 guests present on their special day.
Adolf Hitler formed the Schutzstaffel, the infamous paramilitary organization known to most as the SS.
Elon Musk bought a 9.2% stake in Twitter, amounting to $2.9 billion.
Moscow was mentioned for the very first time in historical records when two princes met there for a great banquet.
Bill Gates and Paul Allen founded Microsoft.
