# Transcript

Maria Townsend:

This is my height measured in books, not a common unit of measurement but still an interesting one. This does give us a problem though. If I measure myself again using other books I’ll get a different answer as they’re not all the same size.

So to use the book as a unit of measurement I’d always have to use the same book and tell everybody what that book was. And something similar is true for all measurements as you’ll find out this week.