Dear readers,

Here’s the difference:

•  Cement is the power used to make concrete

•  Cement is to concrete what flour is to cake

•  Cement comes in a bag; you can walk on concrete

Headlines of articles — incorrect usage:

•  “How to Make a Nice Cement Patio”

•  “Building a Cement Patio Is no Easy Chore”

•  How to Build a Cement Block Patio

Portland cement resemblance to a stone quarried on the Isle of Portland in the English Channel.

Graham Marr
Palo Alto, California