|Other Retailer||Price Checked Time||Their Price in AUD||Our Price|
|Amazon US||8 days ago||30.57||$19.97||You save $10.60|
|Amazon UK||3 days ago||30.49||$19.97||You save $10.52|
|Book Depository US||3 days ago||22.03||$19.97||You save $2.06|
Ian Stewart, an active popularizer of mathematics, university professor, and former columnist for Scientific American's "Mathematical Games" column.
"Ian Stewart's quirky humor and imaginative story telling entice readers into a fascinating world of mathematical curiosities and mind-tickling puzzles."