A brilliant app idea that I'm giving away for free. Take it. Make it. I'll be your first customer.

Here's my vision:

I'm driving down Starr Boulevard in some tiny town in Somewhereville, USA. I come to a traffic light and stop. I remove my phone, click on the app, and instantly, I am transmitted information about the name of this street.

• Why Starr?
• Why the double R?
• Is the street named after a person, and if so, who was it and what did he or she do to deserve the honor of a street name?

I've considered writing a book that explains all of the street names for a random town in the United States. My hometown, perhaps. 

Here's the one problem about my app (and probably my book idea):

I may be the only person in the world who is intensely curious about this topic and desperately wants this information. 

So it might not be quite as profitable as you were hoping.