Ballpark — July 21, 2026

Distance light travels in a single nanosecond

12 inches

Light is incredibly fast, but not instantaneous.

Minutes it takes light to reach Earth from the Sun

~8 minutes

Light takes about 8 minutes, 20 seconds on average.

Percentage of calories from fat in an avocado

~77%

One of the few high-fat plant foods.

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 the world that is water

71%

Most of this is salt water in the oceans.