Ballpark — March 9, 2026
Answers to that day's 5 daily estimation questions.
Total gold ever mined in human history
200,000 tons
Most of it is still in use today.
About how much does a gallon of milk weigh?
~8.6 lb
A gallon of milk weighs a little more than a gallon of water.
About how many calories are in a typical hot dog (with bun)?
~300 calories
A hot dog with bun is often around 250–350 calories.
About how many gallons of gas does a typical car’s fuel tank hold?
~14 gal
Many sedans have fuel tanks in the 12–16 gallon range.
How many minutes does the average person spend laughing in a day?
~6 minutes
Many estimates put daily laughter in the single-digit minutes.