Ballpark — June 16, 2026
Answers to that day's 5 daily estimation questions.
About how many times does a person blink per minute on average?
~15 blinks/min
Many people blink roughly 10–20 times per minute.
About how tall is the average adult woman in the US?
~162 cm
Average adult female height in the US is around 5'4".
About how many US pennies does it take to weigh one pound?
~181 pennies
A modern penny weighs 2.5 grams, so ~145 makes a pound.
About how much caffeine is in a 12-oz cup of brewed coffee?
~140 mg
A typical 12-oz brewed coffee often lands around 100–200 mg of caffeine.
Eyelids a cat has
3 eyelids
It’s called the nictitating membrane.