# data[].attributes.headline
When did the railroad become for travel purposes?

# data[].attributes.subject
When did the railroad become for travel purposes?

# data[].attributes.headline
When did the railroad become industrial? 

# data[].attributes.subject
When did the railroad become industrial? 

# data[].attributes.headline
Why is it called the Age of Exploration?

# data[].attributes.subject
Why is it called the Age of Exploration?

# data[].attributes.headline
How does space exploration benefit the world?

# data[].attributes.subject
How does space exploration benefit the world?

# data[].attributes.headline
Where would be a good place to travel in space besides the moon?

# data[].attributes.subject
Where would be a good place to travel in space besides the moon?

# data[].attributes.headline
What year did the immigrants helped build the railroad?

# data[].attributes.subject
What year did the immigrants helped build the railroad?

# data[].attributes.headline
Who was the first person to fly a plane?

# data[].attributes.subject
Who was the first person to fly a plane?

# data[].attributes.headline
Why there is no transcontinental Railroad?

# data[].attributes.subject
Why there is no transcontinental Railroad?

# data[].attributes.headline
How many exploratory trips have been made to date?

# data[].attributes.subject
How many exploratory trips have been made to date?

# data[].attributes.headline
What is the purpose to explore the space ?

# data[].attributes.subject
What is the purpose to explore the space ?

# data[].attributes.headline
WHERE did the first successful flight took them?

# data[].attributes.subject
WHERE did the first successful flight took them?

# data[].attributes.headline
What was the reason for inventing flight?

# data[].attributes.subject
What was the reason for inventing flight?

# data[].attributes.headline
What happened or what was the trigger point to began Exploring Space .... 

# data[].attributes.subject
What happened or what was the trigger point to began Exploring Space .... 

# data[].attributes.headline
Why were Chinese workers the ones in the west coast?

# data[].attributes.subject
Why were Chinese workers the ones in the west coast?