|
|
|
|
|
|
|
|
|
RKR-NFS |
|
Back and Forth |
1.4 |
236 |
|
|
2
|
|
RKR-NFS |
|
Best Way to See a Shark, The |
1.6 |
421 |
|
|
14
|
|
RKR-NFS |
|
Biggest Animal Ever, The |
1.4 |
268 |
|
|
|
|
RKR-NFS |
|
Biggest Animal On Land, The |
1.4 |
356 |
|
4.0
|
12
|
|
RKR-NFS |
|
Busy, Buzzy Bees |
1.6 |
418 |
|
|
3
|
|
RKR-NFS |
|
Cactuses |
1.4 |
253 |
|
|
7
|
|
RKR-NFS |
|
Chicken or the Egg, The? |
1.4 |
355 |
|
|
6
|
|
RKR-NFS |
|
Can You See the Wind? |
1.6 |
448 |
|
|
1
|
|
RKR-NFS |
|
Cougar: Lion of the Mountains |
1.4 |
399 |
|
3.0
|
7
|
|
RKR-NFS |
|
Cubs and Colts and Calves and Kittens |
1.4 |
266 |
|
|
15
|
|
RKR-NFS |
|
Energy from the Sun |
1.6 |
438 |
|
3.0
|
24
|
1
|
RKR-NFS |
|
Earth Is Mostly Ocean, The |
1.6 |
463 |
|
|
15
|
|
RKR-NFS |
|
Ferns |
1.4 |
308 |
|
|
6
|
1
|
RKR-NFS |
|
Flies Are Fascinating |
1.4 |
349 |
|
|
6
|
|
RKR-NFS |
|
Friendly Dolphins |
1.6 |
470 |
|
|
|
|
RKR-NFS |
|
Frogs and Toads and Tadpoles, Too |
1.4 |
255 |
|
|
8
|
|
RKR-NFS |
|
From Seed to Plant |
1.4 |
289 |
|
|
8
|
|
RKR-NFS |
|
Getting Ready for Space |
1.4 |
328 |
|
|
6
|
|
RKR-NFS |
|
Giant Pandas: Gifts from China |
1.6 |
433 |
|
|
|
|
RKR-NFS |
|
Good Mushrooms and Bad Toadstools |
1.6 |
502 |
|
|
16
|
|
RKR-NFS |
|
Good Night's Sleep, A |
1.4 |
393 |
|
|
7
|
1
|
RKR-NFS |
|
Gator or Croc? |
1.6 |
438 |
|
|
6
|
|
RKR-NFS |
|
Hearing Things |
1.4 |
277 |
|
|
12
|
|
RKR-NFS |
|
Horns and Antlers |
1.4 |
394 |
|
1.0
|
8
|
|
RKR-NFS |
|
Horses, Horses, Horses |
1.4 |
278 |
|
|
4
|
|
RKR-NFS |
|
Hot and Cold |
1.6 |
406 |
|
|
18
|
|
RKR-NFS |
|
How Do You Know It's Fall? |
1.4 |
222 |
|
|
18
|
|
RKR-NFS |
|
How Do You Know It's Spring? |
1.4 |
234 |
|
|
17
|
|
RKR-NFS |
|
How Do You Know It's Summer? |
1.4 |
218 |
|
|
15
|
|
RKR-NFS |
|
How Do You Know It's Winter? |
1.4 |
212 |
|
2.0
|
15
|
|
RKR-NFS |
|
How Animals See Things |
1.6 |
460 |
|
|
9
|
|
RKR-NFS |
|
Hard-to-See Animals |
1.6 |
450 |
|
|
7
|
|
RKR-NFS |
|
Icebergs, Ice Caps, and Glaciers |
1.6 |
529 |
|
|
1
|
|
RKR-NFS |
|
If It Weren't for Farmers |
1.4 |
370 |
|
|
7
|
|
RKR-NFS |
|
Inside an Ant Colony |
1.6 |
463 |
|
|
3
|
|
RKR-NFS |
|
It's a Fruit, It's a Vegetable, It's a Pumpkin |
1.4 |
335 |
|
|
20
|
|
RKR-NFS |
|
It's a Good Thing There Are Insects |
1.4 |
254 |
|
|
3
|
|
RKR-NFS |
|
It Could Still Be a Butterfly |
1.6 |
453 |
|
3.0
|
9
|
|
RKR-NFS |
|
It Could Still Be Coral |
1.6 |
408 |
|
|
1
|
|
RKR-NFS |
|
It Could Still Be a Dinosaur |
1.4 |
312 |
|
|
11
|
|
RKR-NFS |
|
It Could Still Be Endangered |
1.4 |
272 |
|
|
|
|
RKR-NFS |
|
It Could Still Be a Flower |
1.4 |
217 |
|
|
10
|
|
RKR-NFS |
|
It Could Still Be a Lake |
1.4 |
304 |
|
|
3
|
|
RKR-NFS |
|
It Could Still Be a Mammal |
1.4 |
212 |
|
|
11
|
|
RKR-NFS |
|
It Could Still Be a Tree |
1.4 |
233 |
|
|
12
|
|
RKR-NFS |
|
It Could Still Be a Worm |
1.6 |
463 |
|
|
5
|
|
RKR-NFS |
|
Let's Talk About Tongues |
1.6 |
400 |
|
|
4
|
1
|
RKR-NFS |
|
Let's Visit Some Islands |
1.6 |
549 |
|
|
13
|
|
RKR-NFS |
|
Life in a Pond |
1.6 |
407 |
|
|
9
|
|
RKR-NFS |
|
Life in a Tide Pool |
1.4 |
365 |
|
|
|
|
RKR-NFS |
|
Life in a Wetland |
1.6 |
458 |
|
|
|
|
RKR-NFS |
|
Liftoff! |
1.4 |
299 |
|
|
2
|
|
RKR-NFS |
|
Living on a Space Shuttle |
1.4 |
252 |
|
1.0
|
8
|
|
RKR-NFS |
|
All About Heat |
1.4 |
283 |
|
|
6
|
|
RKR-NFS |
|
All About Light |
1.4 |
271 |
|
|
7
|
|
RKR-NFS |
|
All About Sound |
1.4 |
277 |
|
|
11
|
|
RKR-NFS |
|
All the Colors of the Rainbow |
1.6 |
514 |
|
|
13
|
|
RKR-NFS |
|
All Along the River |
1.4 |
367 |
|
|
17
|
|
RKR-NFS |
|
Lands of Grass |
1.4 |
268 |
|
|
|
|
RKR-NFS |
|
Look at Teeth, A |
1.6 |
462 |
|
|
|
|
RKR-NFS |
|
Mammals of Long Ago |
1.4 |
272 |
|
|
9
|
|
RKR-NFS |
|
Monkeys Are a Lot Like Us |
1.4 |
382 |
|
|
6
|
|
RKR-NFS |
|
Maple Trees |
1.4 |
300 |
|
|
14
|
|
RKR-NFS |
|
Animals in the Zoo |
1.4 |
229 |
|
|
15
|
|
RKR-NFS |
|
Animals on the Move |
1.4 |
249 |
|
|
18
|
|
RKR-NFS |
|
Animals under the Ground |
1.6 |
525 |
|
|
9
|
|
RKR-NFS |
|
North, South, East, and West |
1.4 |
307 |
|
|
10
|
|
RKR-NFS |
|
Our Living Forests |
1.6 |
430 |
|
|
14
|
|
RKR-NFS |
|
Pine Trees |
1.4 |
338 |
|
|
8
|
|
RKR-NFS |
|
Please Don't Feed the Bears |
1.4 |
210 |
|
1.0
|
11
|
|
RKR-NFS |
|
Plants that Eat Animals |
1.4 |
289 |
|
|
9
|
|
RKR-NFS |
|
Apples of Your Eye |
1.4 |
306 |
|
5.0
|
23
|
|
RKR-NFS |
|
Push and Pull |
1.4 |
231 |
|
|
13
|
|
RKR-NFS |
|
Raccoons |
1.4 |
262 |
|
4.0
|
14
|
|
RKR-NFS |
|
Arctic Tundra: Land with No Trees |
1.6 |
449 |
|
|
|
|
RKR-NFS |
|
Recycle That! |
1.4 |
385 |
|
|
16
|
|
RKR-NFS |
|
Really Big Cats |
1.6 |
506 |
|
|
11
|
|
RKR-NFS |
|
Arms and Legs and Other Limbs |
1.4 |
365 |
|
|
15
|
|
RKR-NFS |
|
Around and Around |
1.4 |
254 |
|
|
8
|
|
RKR-NFS |
|
These Birds Can't Fly |
1.4 |
395 |
|
|
|
|
RKR-NFS |
|
Seeing Seabirds |
1.4 |
386 |
|
3.0
|
9
|
|
RKR-NFS |
|
Shellfish Aren't Fish |
1.6 |
520 |
|
|
12
|
|
RKR-NFS |
|
Simple Machines |
1.4 |
338 |
|
2.0
|
13
|
1
|
RKR-NFS |
|
Snail's Pace, A |
1.4 |
338 |
|
|
7
|
1
|
RKR-NFS |
|
Solid, Liquid, or Gas? |
1.6 |
455 |
|
4.0
|
17
|
|
RKR-NFS |
|
Solar System, The |
1.4 |
323 |
|
|
21
|
|
RKR-NFS |
|
So That's How the Moon Changes Shape! |
1.4 |
261 |
|
|
13
|
|
RKR-NFS |
|
Spiders Are Not Insects |
1.4 |
368 |
|
|
4
|
|
RKR-NFS |
|
Squirrels and Chipmunks |
1.6 |
444 |
|
|
16
|
|
RKR-NFS |
|
Astronauts |
1.4 |
258 |
|
|
5
|
|
RKR-NFS |
|
Stars of the Sea |
1.4 |
225 |
|
5.0
|
8
|
|
RKR-NFS |
|
Sun's Family of Planets, The |
1.4 |
370 |
|
|
17
|
|
RKR-NFS |
|
Sun Is Always Shining Somewhere |
1.4 |
276 |
|
|
9
|
|
RKR-NFS |
|
Save the Rain Forests |
1.6 |
445 |
|
|
11
|
|
RKR-NFS |
|
Telling Tails |
1.4 |
384 |
|
|
11
|
|
RKR-NFS |
|
Tiny Life in the Air |
1.4 |
339 |
|
|
11
|
|
RKR-NFS |
|
Tiny Life in a Puddle |
1.4 |
312 |
|
|
5
|
|
RKR-NFS |
|
Tiny Life in Your Home |
1.4 |
307 |
|
|
14
|
|
RKR-NFS |
|
Tiny Life on the Ground |
1.4 |
336 |
|
|
7
|
|
RKR-NFS |
|
Tiny Life on Plants |
1.4 |
332 |
|
|
6
|
|
RKR-NFS |
|
Tiny Life on Your Body |
1.4 |
345 |
|
|
7
|
|
RKR-NFS |
|
Taking Root |
1.4 |
277 |
|
|
8
|
2
|
RKR-NFS |
|
Top and Bottom of the World, The |
1.6 |
514 |
|
|
|
|
RKR-NFS |
|
Up and Down |
1.4 |
222 |
|
|
9
|
|
RKR-NFS |
|
Upside-Down Sloth, The |
1.4 |
358 |
|
|
11
|
|
RKR-NFS |
|
Vegetables, Vegetables! |
1.4 |
288 |
|
|
15
|
1
|
RKR-NFS |
|
We Love Fruit! |
1.4 |
281 |
|
|
19
|
|
RKR-NFS |
|
When a Storm Comes Up |
1.6 |
407 |
|
|
11
|
|
RKR-NFS |
|
When You Look Up at the Moon |
1.4 |
265 |
|
|
|
|
RKR-NFS |
|
Where Do Puddles Go? |
1.6 |
440 |
|
|
|
|
RKR-NFS |
|
Wheat We Eat, The |
1.6 |
407 |
|
|
|
|
RKR-NFS |
|
What's the Weather Today? |
1.4 |
256 |
|
|
10
|
|
RKR-NFS |
|
What Do You See in a Cloud? |
1.4 |
393 |
|
|
|
|
RKR-NFS |
|
What Is Electricity? |
1.4 |
301 |
|
|
12
|
|
RKR-NFS |
|
What Is Friction? |
1.4 |
321 |
|
3.0
|
7
|
|
RKR-NFS |
|
What Is Gravity? |
1.4 |
264 |
|
|
|
|
RKR-NFS |
|
What Magnets Can Do |
1.6 |
511 |
|
|
10
|
|
RKR-NFS |
|
Wonder of a Waterfall |
1.6 |
414 |
|
|
7
|
|
RKR-NFS |
|
They Could Still Be Mountains |
1.6 |
467 |
|
|
13
|
|