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- Gears go, wheels roll, by Mark Weakland
- How tall?, wacky ways to compare height, by Mark Weakland ; illustrated by Igor Sinkovec
- Las semillas se plantan, las semillas crecen, Seeds go, seeds grow, por/by Mark Weakland
- Thud!, Wile E. Coyote experiments with forces and motion, by Mark Weakland ; illustrated by Christian Cornia
- Los imanes atraen, los imanes repelen, Magnets push, magnets pull, por/by Mark Weakland
- Football ABC, by Mark Weakland
- Magnets push, magnets pull, by Mark Weakland
- Zombies and forces and motion, by Mark Weakland ; illustrated by Gervasio
- Football colors, by Mark Weakland
- Bubbles float, bubbles pop, by Mark Weakland
- How heavy?, wacky ways to compare weight, by Mark Weakland ; illustrated by Bill Bolton
- Football colors, by Mark Weakland
- Magnets push, magnets pull, by Mark Weakland
- Seeds go, seeds grow, by Mark Weakland
- Los imanes atraen, los imanes repelen, Magnets push, magnets pull, por/by Mark Weakland
- How tall?, wacky ways to compare height, by Mark Weakland ; illustrated by Igor Sinkovec
- Wacky comparisons, wacky ways to compare size, by Mark Weakland & Jessica Gunderson ; illustrated by Keino, Bill Bolton, and Igor Sinkovec
- Football opposites, by Mark Weakland
- Smash!, Wile E. Coyote experiments with simple machines, by Mark Weakland ; Illustrated by Christian Cornia
- Gears go, wheels roll, by Mark Weakland
- Wacky comparisons, wacky ways to compare size, by Mark Weakland & Jessica Gunderson ; illustrated by Keino, Bill Bolton, and Igor Sinkovec
- Las burbujas flotan, las burbujas explotan, Bubbles float, bubbles pop, por/by Mark Weakland
- Las semillas se plantan, las semillas crecen, Seeds go, seeds grow, por/by Mark Weakland
- Seeds go, seeds grow, by Mark Weakland
- Smash!, Wile E. Coyote experiments with simple machines, by Mark Weakland ; Illustrated by Christian Cornia
- Bubbles float, bubbles pop, by Mark Weakland
- How heavy?, wacky ways to compare weight, by Mark Weakland ; illustrated by Bill Bolton
- Los engranajes trabajan, las ruedas ruedan, Gears go, wheels roll, por/by Mark Weakland
- Zombies and forces and motion, by Mark Weakland ; illustrated by Gervasio
- Los engranajes trabajan, las ruedas ruedan, Gears go, wheels roll, por/by Mark Weakland
- Football ABC, by Mark Weakland
- Weakland, Mark, Science starts
- Weakland, Mark, Science starts
- Thud!, Wile E. Coyote experiments with forces and motion, by Mark Weakland ; illustrated by Christian Cornia
- Football opposites, by Mark Weakland
- Las burbujas flotan, las burbujas explotan, Bubbles float, bubbles pop, por/by Mark Weakland