Unit 1 |
4 |
How did the Olympic Games begin? |
Unit 2 |
6 |
How do crocodiles clean their teeth? |
Unit 3 |
8 |
What is the Statue of Liberty? |
Unit 4 |
10 |
Why do leaves change color in the fall? |
Unit 5 |
12 |
Where did the ideas for our government come from? |
Unit 6 |
14 |
Why does a jumping bean jump? |
Unit 7 |
16 |
What is Earth Day? |
Unit 8 |
18 |
What is a mongoose? |
Unit 9 |
20 |
How do people know what time it is? |
Unit 10 |
22 |
What is the praying mantis? |
Unit 11 |
24 |
Who was Anne Frank? |
Unit 12 |
26 |
How is paper made? |
Unit 13 |
28 |
What was the Titanic? |
Unit 14 |
30 |
What is the powder on a butterfly’s wings? |
Unit 15 |
32 |
Why is Mt. Rushmore famous? |
Unit 16 |
34 |
What plant eats meat? |
Unit 17 |
36 |
What was a victory garden? |
Unit 18 |
38 |
Where does chocolate come from? |
Unit 19 |
40 |
What tea party became a part of history? |
Unit 20 |
42 |
Where does the trap-door spider live? |
Unit 21 |
44 |
What is recycling? |
Unit 22 |
46 |
What is a shooting star? |
Unit 23 |
48 |
Where was the first subway started? |
Unit 24 |
50 |
Why is the lionfish left alone? |
Unit 25 |
52 |
How has the potato changed history? |
Unit 26 |
54 |
How do dolphins sleep without drowning? |
Unit 27 |
56 |
What is the birthday of the United States of America? |
Unit 28 |
58 |
How does gravity affect the tides? |
Unit 29 |
60 |
Where do people pray to mountains? |
Unit 30 |
62 |
What bugs us every 17 years? |
Unit 31 |
64 |
What can be learned from ancient graves? |
Unit 32 |
66 |
Why did the dinosaurs die out? |
Unit 33 |
68 |
What colorful art form began in America? |
Unit 34 |
70 |
What happens underground during winter? |
Unit 35 |
72 |
How did Maggie and Lillian Rogers learn so much about the White House? |
Unit 36 |
74 |
Why don’t people ride zebras? |
Unit 37 |
76 |
Who holds the record for staying alive at sea the longest? |
Unit 38 |
78 |
Why do you look upside down in a spoon? |
Unit 39 |
80 |
What is Carnegie Hall? |
Unit 40 |
82 |
What is ball lightning? |
Unit 41 |
84 |
Who was Calbraith Rodgers? |
Unit 42 |
86 |
Where did the first magnets come from? |
Unit 43 |
88 |
Why did the Spanish come to the Americas? |
Unit 44 |
90 |
What animal makes bubbles on leaves? |
Unit 45 |
92 |
What was so special about climbing Half Dome? |
Unit 46 |
94 |
What unique thing do bowerbirds do? |