#973.9

[your-dewey-decimal-number-is]

fidget/sensory toys? and is there a classification that would be given to a book on the period of time in which fidget spinners were a major fad?

There's no category for fidget toys specifically, but toys in general fall under 790.133, and books on fidget spinners have been placed there or 793.4 for "action games." The time period, mid-to-late 2010s, would be under 973.932 and 973.933 (though most of those are about political/governmental/civic history rather than social history/fads)

[your-dewey-decimal-number-is]

why does Richard Nixon have his own Dewey Decimal number. what qualifies an individual person to have one

To be more specific, the Dewey Decimal Number 973.924 refers to the presidency of Richard Nixeon rather than Nixon himself. Individual historical figures can be found under the biography section, but all US presidents have their own classification in the non-fiction section under their respective eras of American history. 973.924 refers to anything that happened in the United States between 1969 and 1974, with emphasis on the Nixon administration.

[your-dewey-decimal-number-is]

Watergate (the scandal, not the hotel)

973.924

the presidency of richard nixon