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How much is 13?

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It's about one-tenth the number of Keys on a Piano.
In other words, 13 is 0.150 times the count of Keys on a Piano, and the count of Keys on a Piano is 6.70 times that amount.
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about seven times the number of Escalators in the State of Wyoming.
In other words, the count of Escalators in the State of Wyoming is 0.10 times 13.
(2013 figures)
It's about one-tenth the number of Wolves in Yellowstone National Park.
In other words, 13 is 0.1250 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 8 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
It's about one-tenth the number of Elements on the Periodic Table.
In other words, 13 is 0.110 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 9.09 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)
It's about one-tenth the number of Union Stations in the United States.
In other words, 13 is 0.0963 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 10.40 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
Typically shared between multiple railroad companies and stations, there are about 135 "Union Stations" in the United States. Of these, the busiest station is Chicago Union Station, which handles 120,000 passengers each year.
It's about one-tenth the number of Moons in our Solar System.
In other words, the count of Moons in our Solar System is 11.20 times 13.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about one-fifteenth the number of John Wayne films.
In other words, the count of John Wayne films is 13.70 times 13.
(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)