Unit 1 |
4 |
What is the “father of waters”? |
Unit 2 |
6 |
Why do skunks smell bad? |
Unit 3 |
8 |
Why do clowns go to school? |
Unit 4 |
10 |
Why do people yawn? |
Unit 5 |
12 |
Who was the first woman doctor in the United States? |
Unit 6 |
14 |
How do horses run? |
Unit 7 |
16 |
How have zoos changed? |
Unit 8 |
18 |
What is a walking stick? |
Unit 9 |
20 |
How long have people used pencils? |
Unit 10 |
22 |
What is a flying fox? |
Unit 11 |
24 |
Do you know what to do in a fire? |
Unit 12 |
26 |
Where does lightning go? |
Unit 13 |
28 |
Are stamps used only for the mail? |
Unit 14 |
30 |
What is in a camel’s hump? |
Unit 15 |
32 |
When was ice cream first made? |
Unit 16 |
34 |
What is the smallest bird in the world? |
Unit 17 |
36 |
How did yo-yos get their start? |
Unit 18 |
38 |
Can horses dance? |
Unit 19 |
40 |
What were the first tall buildings? |
Unit 20 |
42 |
Where does salt come from? |
Unit 21 |
44 |
What is the Gateway Arch? |
Unit 22 |
46 |
How do frogs grow? |
Unit 23 |
48 |
Who was the first African American pilot? |
Unit 24 |
50 |
What is a falling star? |
Unit 25 |
52 |
Who made the first jeans? |
Unit 26 |
54 |
How are tulips different from other flowers? |
Unit 27 |
56 |
Who was Arthur Ashe? |
Unit 28 |
58 |
How is maple syrup made? |
Unit 29 |
60 |
Where did the first woman vote? |
Unit 30 |
62 |
What is a jellyfish? |
Unit 31 |
64 |
What is a ghost town? |
Unit 32 |
66 |
Is there a dog that does not bark? |
Unit 33 |
68 |
What did Louis Braille do? |
Unit 34 |
70 |
How do whales talk? |
Unit 35 |
72 |
How did Annie Oakley become famous? |
Unit 36 |
74 |
Why can cockroaches live almost anywhere? |
Unit 37 |
76 |
What is origami? |
Unit 38 |
78 |
How does a starfish see? |
Unit 39 |
80 |
What did the Taíno Indians give today’s people? |
Unit 40 |
82 |
Can an owl move its eyes? |
Unit 41 |
84 |
Has the American flag always been red, white, and blue? |
Unit 42 |
86 |
What are ant cows? |
Unit 43 |
88 |
Why did Abraham Lincoln grow a beard? |
Unit 44 |
90 |
Can a fish cough? |
Unit 45 |
92 |
Who is Sally Ride? |
Unit 46 |
94 |
What are icebergs? |