Ballpark — August 11, 2026
Answers to that day's 5 daily estimation questions.
Average speed of an Olympic sprinter (Usain Bolt)
27 mph
Peak speed during a 100m dash.
Percentage of Americans who have never left the US
~25%
Many others have only traveled to one or two countries.
Total length of the Great Wall of China
13,175 miles
The main line is shorter; this includes all branches.
Hearts in an octopus
3 hearts
Two pump blood to the gills; one to the rest of the body.
Stomachs a cow has
4 stomachs
Rumen, reticulum, omasum, and abomasum.