The Hot Rod staff shows off a variety of Bonneville, midget, circle-track and hot rod numbering styles from now and then. Check it out at hotrod.com or the May 2012 issue of HOT ROD Magazine.

Picture Puzzle IQ Test: Prove Your Intelligence – Find the Hidden Number in 8 Seconds! Look closely at the green circle in the image below. Somewhere in there, a number is hidden – but ...

Test your vision with a captivating optical illusion that hides a number within a neon green circle. Besides being a fun ...

Our very own Circle Round picture books, available now. The page-turning journey begins Saturday, July 9 in Boston at WBUR's CitySpace with a Circle Round book launch party .