ผู้เขียน: Alexa Coelho

Alexa Coelho is a curious teenager who asks a lot of chemistry questions. Simon Quellen Field is the author of Culinary Reactions, Gonzo Gizmos, and Why There”s Antifreeze in Your Toothpaste and the creator of the popular website www.scitoys.com. They both live in Los Gatos, California.