Ballpark #6 — answers
July 31, 2026 · five estimation questions and their accepted values
Question 1
How many neurons are in the human brain, in billions?
86
Question 2
How many Google searches happen per day, in billions?
8.5
Widely cited estimate; Google does not publish exact figures.
Question 3
How many strings does a standard guitar have?
6
Question 4
How tall is an adult giraffe, in meters?
5.5
Adult males average ~5 to 6 m.
Question 5
How long is an Olympic swimming pool, in meters?
50
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