Beginning in the 1920s, the complex, plot-driven, whodunit genre of detective fiction experienced a 30-year Golden Age. In these stories, the puzzle takes center stage, and readers, who are provided with clues throughout the book, are challenged to deduce the perpetrator’s identity before it is revealed in the mystery’s final pages. Wilkie Collins’ The Moonstone (1868) is widely regarded as one of the first true whodunits. What famed children’s author also penned a whodunit in 1922? Discuss
Source: The Free Dictionary
To account for inconsistencies between Mercury’s predicted and observed orbital path, French astronomer Urbain Jean Joseph Leverrier postulated that a tiny, hypothetical planet, which he named Vulcan, was present within Mercury’s orbit. Sightings of Vulcan were reported until 1878, and Leverrier died believing he had discovered another planet. Eventually, however, the orbital anomalies were explained by Einstein’s general theory of relativity. After what was the hypothetical planet named? 
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After the deposition and murder of his father, Sultan Ibrahim, 7-year-old Mehmed IV ascended the throne of the Ottoman Empire. Chaos and corruption followed, and though grand vizier Mehmed Köprülü managed to restore order, the empire suffered severe setbacks. In 1683, the Turks besieged Vienna but were repulsed by King John III of Poland, and a Holy League was formed to carry the war into Ottoman territory. Mehmed was deposed after a Turkish defeat by Charles V of Lorraine. Who succeeded him? 
David Hasselhoff is an American actor, singer, and songwriter. Though “The Hoff” spent a six-year stint on The Young and the Restless, he is best known for his roles in Knight Rider and Baywatch. During the late 1980s, he enjoyed significant musical success, particularly in Austria, Switzerland, and Germany. In 1994, Hasselhoff was scheduled to perform a pay-per-view concert that would hopefully reignite his US musical career. What major news event diverted his viewers? 
Edwin Hubble worked as a basketball coach and teacher, served in World War I, and studied law before focusing his energies on astronomy. On January 1, 1925, he made a groundbreaking announcement, declaring that fuzzy “nebulae” seen earlier with less powerful telescopes were not part of our galaxy but were actually galaxies themselves. With the findings now known as Hubble’s law, he was also the first to provide evidence to support what theory about the universe?