Ballpark #19 — answers
August 13, 2026 · five estimation questions and their accepted values
Question 1
How long was the Apollo 11 mission, launch to splashdown, in hours?
195
Question 2
How high is the Golden Gate Bridge deck above the water, in meters?
67
Question 3
How many stone blocks make up the Great Pyramid of Giza?
2300000
Egyptologists' estimate: about 2.3 million.
Question 4
How many time zones does France span, counting overseas territories?
12
Question 5
What is the terminal velocity of a belly-down skydiver, in km/h?
200
Roughly; body position changes it a lot.
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