What do you do when your fantastic editor, Stacey Roderick of Owlkids Books, asks you for photo references of a one-celled life-form that lived over 3.5 billion years ago? You turn to an expert.

I’d like to thank Dr. William F. Martin of the Institute of Molecular Evolution at Heinrich-Heine-Universität Düsseldorf for generously sharing his time and expertise to review the text and advise me when I needed to provide photo references for LUCA – our Last Universal Common Ancestor. LUCA is the one-and-only organism that every living being on Earth can be traced back to. It’s also the subject of One Tiny Bubble – my upcoming picture book with illustrator Dawn Lo, published by Owlkids Books.

Dr. Martin was also generous enough to provide an expert review of the finished book. Here’s what he had to say:

I can’t wait to share LUCA’s inspirational story and Dawn’s vibrant illustrations with our whole Earth family in September.