Rebecca Kai Dotlich is a poet and the author of many award-winning picture books for young readers, including Race Car Count; What Can a Crane Pick Up?; One Day, The End; and What Is Science?, which was a Bank Street College of Education Best Children's Book of the Year and a finalist in the Children's Science Picture Book category of the AAAS/Subaru SB&F Prize for Excellence in Science Books. She loves grouping her vintage marble collection into cupcake tins. But not to worry--she never bakes them. She lives in Indiana.

Sachiko Yoshikawa grew up in Tokyo, where her parents ran a salon. Her mother was a stylist, while her father kept track of the financials, often with an abacus. It was on the abacus that Sachiko learned to add and subtract. She still uses a mental image of her father's abacus when solving simple math problems. Sachiko is the illustrator of Beach Is to Fun as well as What Is Science? She lives in California with her family.