Ballpark — February 26, 2026

Answers to that day's 5 daily estimation questions.

Number of moons orbiting Jupiter

115 moons

The four largest (Galilean moons) were seen by Galileo in 1610.

Total weight of the Great Pyramid of Giza

~6 million tons

Built from 2.3 million limestone blocks.

Average number of times a human blinks per day

~14,875 blinks

Blinking keeps the eyes lubricated and clean.

People who climb Mount Everest each year

800 people

Congestion is becoming a major safety issue.

Distance light travels in a single nanosecond

12 inches

Light is incredibly fast, but not instantaneous.