Ballpark — May 5, 2026

Length of the Nile River

4,130 miles

It is generally considered the longest river in the world.

Average steps a person takes in a lifetime

~216 million steps

Based on an average of 7,500 steps per day over 80 years.

Percentage of oxygen in Earth's atmosphere

21%

This balance has been stable for millions of years.

Total characters in the Lord of the Rings trilogy

~923 characters

Includes every named person, hobbit, elf, and orc.

Number of active volcanoes in the world

~1,350 volcanoes

About 50–70 erupt every single year.