Ballpark — July 22, 2026
Answers to that day's 5 daily estimation questions.
Total length of the Great Wall of China
13,175 miles
The main line is shorter; this includes all branches.
Total billionaires in the world
3,428 billionaires
The US has the most, followed by China and India.
Runtime of the movie Oppenheimer
180 minutes
Christopher Nolan's longest film to date.
Calories in a stick of butter
813 calories
Pure fat is energy-dense.
Total cars in the world
1.4 billion
The majority are in North America, Europe, and China.