|Other Retailer||Price Checked Time||Their Price in NZD||Our Price|
|Amazon UK||6 days ago||38.73||$23.56||You save $15.17|
|Amazon US||4 days ago||30.83||$23.56||You save $7.27|
E. Richard Churchill, Louis V. Loeschnig, and Muriel Mandell are authors of books in the No-Sweat Science series. They each have written several other science-related books for children and young adults.