"Melia is SCIENTIFIC and loves to create things in her backyard laboratory, but something is missing. Her inventions just aren't quite right. Enter Jo, her new friend with an ARTISTIC spirit. When you blend the arts and science, something magical happens!"--Back cover.

Aspiring to build an amazing derby car out of junkyard parts, Peg and Cat enter the neighborhood Tallapegga Twenty and use their shape-recognition and counting skills to assemble their car and count laps in the hope of winning the Golden Cup.

It's Halloween and Peg and Cat have a big problem! Someone has left the park full of trash and the costume parade might be cancelled. Don't freak out, Peg and Cat save the day by sorting and recycling. Then, they discover they've been trick-or-treating with a real, live tiger!

When life gives them a problem to solve, Peg and Cat make lemonade -- and get a lesson in bartering -- in a refreshing new math adventure. It's a hot day, so what could be cooler than setting up a lemonade stand? When Peg needs some marbles to keep her special marble company, she and Cat decide to sell lemonade in exchange for ten marbles a cup. But the Teens have other ideas. "But just one cup for ten marbles?" says Mora. "I'm not made of marbles!"...

Join the Wonder Pets as they contemplate running away to join the circus, forever.