Ballpark #21 — answers
August 15, 2026 · five estimation questions and their accepted values
Question 1
How fast does Earth's surface rotate at the equator, in km/h?
1670
Question 2
How high is Everest South Base Camp, in meters?
5364
Question 3
How much actual gold is in an Olympic gold medal, in grams?
6
The required minimum; the rest is silver.
Question 4
How long is the DNA in a single human cell, stretched out, in meters?
2
Question 5
How deep was the deepest scuba dive ever, in meters?
332
Ahmed Gabr, 2014 world record.
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