Ballpark #26 — answers
August 20, 2026 · five estimation questions and their accepted values
Question 1
What is Earth's circumference at the equator, in kilometers?
40075
Question 2
How many dimples are on a typical golf ball?
336
Typical; designs range 300 to 500.
Question 3
How long does an adult mayfly live, in hours?
24
Many species get far less.
Question 4
How far below sea level is the lowest point of Death Valley, in meters?
86
Question 5
How many hearts does an octopus have?
3
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