Series
I Didn't Know That — 22 titles
Crocodiles Yawn to Keep Cool
Crocodiles Yawn to Keep Cool
OUT OF PRINT$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Dinosaurs Laid Eggs
Dinosaurs Laid Eggs
SUBJECT TO AVAILABILITY$19.75RRP $21.95
10+ $18.65 · 20+ $17.56
Giant Pandas Eat All Day Long
Giant Pandas Eat All Day Long
OUT OF PRINT$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Mountains Gush Lava and Ash
Mountains Gush Lava and Ash
SUBJECT TO AVAILABILITY$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
People Chase Twisters
People Chase Twisters
SUBJECT TO AVAILABILITY$22.72RRP $25.25
10+ $21.46 · 20+ $20.20
Quakes Split the Ground Open
Quakes Split the Ground Open
OUT OF PRINT$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Sharks Keep Losing Their Teeth
Sharks Keep Losing Their Teeth
SUBJECT TO AVAILABILITY$22.72RRP $25.25
10+ $21.46 · 20+ $20.20
Some Birds Hang Upside Down
Some Birds Hang Upside Down
SUBJECT TO AVAILABILITY$19.75RRP $21.95
10+ $18.65 · 20+ $17.56
Some Boats Have Wings
Some Boats Have Wings
SUBJECT TO AVAILABILITY$22.72RRP $25.25
10+ $21.46 · 20+ $20.20
Some Bugs Glow in the Dark
Some Bugs Glow in the Dark
SUBJECT TO AVAILABILITY$19.75RRP $21.95
10+ $18.65 · 20+ $17.56
Some Cars Can Swim
Some Cars Can Swim
SUBJECT TO AVAILABILITY$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Some Planes Hover
Some Planes Hover
SUBJECT TO AVAILABILITY$16.78RRP $18.65
10+ $15.85 · 20+ $14.92
Some Plants Grow in Mid-Air
Some Plants Grow in Mid-Air
OUT OF PRINT$22.72RRP $25.25
10+ $21.46 · 20+ $20.20
Some Snakes Spit Poison
Some Snakes Spit Poison
SUBJECT TO AVAILABILITY$19.75RRP $21.95
10+ $18.65 · 20+ $17.56
Some Trains Run on Water
Some Trains Run on Water
OUT OF PRINT$19.75RRP $21.95
10+ $18.65 · 20+ $17.56
Spiders Have Fangs
Spiders Have Fangs
SUBJECT TO AVAILABILITY$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
The Sun Is a Star
The Sun Is a Star
SUBJECT TO AVAILABILITY$19.75RRP $21.95
10+ $18.65 · 20+ $17.56
Tidal Waves Wash Away Cities
Tidal Waves Wash Away Cities
SUBJECT TO AVAILABILITY$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Truck Can Be as Big as a House,a
Truck Can Be as Big as a House,a
OUT OF PRINT$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Whales Can Sing
Whales Can Sing
SUBJECT TO AVAILABILITY$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
Wolves Howl at the Moon
Wolves Howl at the Moon
SUBJECT TO AVAILABILITY$24.70RRP $27.45
10+ $23.33 · 20+ $21.96
You Can Jump Higher Than the Moon
You Can Jump Higher Than the Moon
SUBJECT TO AVAILABILITY$19.75RRP $21.95
10+ $18.65 · 20+ $17.56