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June 28th is celebrated as Tau Day by mathematics enthusiasts, promoting the use of the mathematical constant τ (tau) as an alternative to π (pi). Tau is approximately 6.28, or 2π, and some mathematicians argue it provides a more intuitive understanding of circles and their properties.

Additionally, June 28th marks the assassination of Archduke Franz Ferdinand of Austria in 1914, an event that triggered the outbreak of World War I. The assassination had profound geopolitical consequences, leading to a global conflict that reshaped the political landscape of the 20th century.

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