Good question!

Author
Carson, Mary Kay Sandler, Martin W Stewart, Melissa Dixon, Franklin W Richmond, Benjamin Smith, Kelly
 
1)  Did it all start with a snowball fight?: and other questions about the American Revolution
2)  What sank the world's biggest ship?: and other questions about the RMS Titanic
3)  Why did the whole world go to war?: and other questions about World War II
4)  How does a caterpillar become a butterfly?: and other questions about... butterflies
Author
Publisher
Sterling
Pub. Date
2014
Physical Desc
32 p. : col. ill. ; 21 x 26 cm.
Description
6)  How does the ear hear?: and other questions about... the five senses
7)  How is my brain like a supercomputer?: and other questions about the human body
Author
9)  How strong is an ant?: and other questions about bugs and insects
10)  What makes a tornado twist?: and other questions about weather
11)  What was America's deadliest war?: and other questions about... the Civil War
Author
Publisher
Sterling Children's Books
Pub. Date
[2014]
Physical Desc
31 pages : illustrations (chiefly color) ; 21 x 26 cm
Description
13)  Who were the American pioneers?: and other questions about . . . Westward expansion
Author
Publisher
Sterling Children's Books
Pub. Date
[2014]
Physical Desc
32 pages : color illustrations ; 21 x 26 cm
Description
15)  Why does Earth spin?: and other questions about... our planet
Author
Publisher
Sterling Children's Books
Pub. Date
[2014]
Physical Desc
32 pages : color illustrations ; 21 x 27 cm
Description
17)  What are the three branches of the government?: and other questions about the U.S. Constitution
Author
Publisher
Sterling Children's Books
Pub. Date
[2015]
Physical Desc
30 pages : illustrations (some color) ; 21 x 26 cm
Description
Author
Publisher
Sterling Children's Books
Pub. Date
[2016]
Physical Desc
32 pages : color illustrations, color map ; 21 x 26 cm.
Description
20)  Where do garbage trucks go?: and other questions about ... trash and recycling