|Other Retailer||Price Checked Time||Their Price in NZD||Our Price|
|Amazon UK||yesterday||42.14||$24.95||You save $17.19|
|Amazon US||1 days ago||30.26||$24.95||You save $5.31|
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.