Ballpark #56 — answers
September 19, 2026 · five estimation questions and their accepted values
Question 1
How tall is the tallest sand dune in the world, in meters?
383
Duna Federico Kirbus in Argentina.
Question 2
How many years did Michelangelo spend painting the Sistine Chapel ceiling?
4
1508 to 1512.
Question 3
How many liters of water does a large oak tree draw up per day?
400
Question 4
How much does a cubic meter of gold weigh, in kilograms?
19300
Question 5
How many days does the fastest solo sail around the world take?
40
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