There are millions of people who live in the Tornado belt. I want to
buy a Tornado warning device for my home. The National Weather service
delights in waking me up in the middle of the night if Tornado
conditions occur in the neighboring State. I want to install a device
on the roof of my house that listens for the characteristic sound of a
Tornado approaching on the ground.

Think about this problem because the solution could make you rich.