Most of us have probably stood on a beach or stood on the edge of a large flat field (I did this in Nebraska last week) and wondered just how far we can actually see. Brain Stuff offers answers to this question in the following one minute video.

Applications for Education
Extend this lesson by asking your students to try to calculate how far a pilot can see from the cockpit of a 747 cruising at 35,000 feet on a clear day.