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How much is 91?

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It's about the number of Keys on a Piano.
It's about nine-tenths the number of Wolves in Yellowstone National Park.
In other words, 91 is 0.8750 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 1.140 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about three-fourths the number of Elements on the Periodic Table.
In other words, 91 is 0.7710 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 1.30 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-and-three-tenths times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.770 times 91.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about two-thirds the number of Union Stations in the United States.
In other words, 91 is 0.6740 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 1.480 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
It's about three-fifths the number of Moons in our Solar System.
In other words, 91 is 0.6230 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 1.610 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about one-and-seven-tenths times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.590 times 91.
(2016 figures) (sovereign states recognized by the UN only)