The Count of Things

Bluebulb Projects' The Measure of Things presents:

It's about the number of Living Kings and Queens

(2015 figures) (distinct Monarchs)
As of 2015, the world has fifteen Kings and Queens reigning over 45 countries. Of all these, Queen Elizabeth the II is the only reigning Queen; she has monarchical authority over the sixteen of the Commonwealth nations.

It's about one-and-two-thirds times the number of Symphonies Composed by Beethoven

In other words, 15 is 1.666666666670 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.5999999999990 times that amount.

(a.k.a. Ludwig van Beethoven)

It's about three-fifths the number of Countries in the European Union

In other words, 15 is 0.560 times the count of Countries in the European Union, and the count of Countries in the European Union is 1.80 times that amount.

(a.k.a. EU) (2016 figures)

It's about three-tenths the number of Teeth in a Great White Shark's Mouth

In other words, 15 is 0.310 times the count of Teeth in a Great White Shark's Mouth, and the count of Teeth in a Great White Shark's Mouth is 3.20 times that amount.

(Carcharodon carcharias) (average; including developing rows)

It's about one-fourth the number of Countries in Africa

In other words, 15 is 0.270 times the count of Countries in Africa, and the count of Countries in Africa is 3.70 times that amount.

(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 56 sovereign countries recognized by the United Nations as of 2020. It is the second-most populous continent in the world, with 1.3 billion inhabitants.List_of_sovereign_states_and_dependent_territories_in_Africa

It's about four times the number of Living U.S. Presidents

In other words, the count of Living U.S. Presidents is 0.30 times 15.

(a.k.a. Presidents of the United States; a.k.a. Presidents of the United States of America; a.k.a. POTUS), (2016 figures) (including current)

It's about one-fifth the number of Submarines in the US Navy

In other words, 15 is 0.210 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 4.80 times that amount.

(a.k.a. Subs) (includes all types, all classes) (2015 figures)