1、Why do people enjoy watching scary movies?
2、Why is the sky blue?
3、Why do we dream?
4、Why do we need to sleep?
5、Why do some people have allergies?
6、Why is the ocean salty?
7、Why do birds migrate?
8、Why do we have different time zones?
9、Why do some flowers only bloom at night?
10、Why do people lie?
11、Why do some people have phobias?
12、Why do seasons change?
13、Why do some animals hibernate?