Ballpark #36 — answers
August 30, 2026 · five estimation questions and their accepted values
Question 1
How tall is the Leaning Tower of Pisa, in meters?
57
About 57 m on the high side; it leans roughly 4 degrees.
Question 2
How many bones are in a giraffe’s neck?
7
Seven, the same as a human — just much longer.
Question 3
How many liters of blood are in an adult human body?
5
Question 4
How many satellites are in the operational GPS constellation?
31
Around 31 healthy satellites; 24 is the baseline requirement.
Question 5
What is the minimum sustained wind speed for a hurricane, in km/h?
119
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