Grant Snider and His Brilliant Math Comics
A picture speaks louder than a thousand words, and my friend Grant shows this is very true indeed:
Acknowledgement: The creations you see here belong to the genius known as Grant Snider, who has kindly allowed me to reproduce them on this page. Do support his blog Incidental Comics.
[His exact response to me over the internet:
"Hi Frederick,
Thanks for the email. Feel free to repost any Math comics from my site, with proper attribution (including my name and a link back to my blog). Best of luck in your teaching!"]