What is the attraction to speed?

Why do some humans like to race?

Is the attraction to speed part of our competitive nature?  Is it hormone related? 

I can understand the need to ensure emergency vehicles arrive on time to save lives and property. I would like to understand the benefits of racing for racing's sake with burning fuel, producing harmful emissions and taking risks.  
 
Hop over to The Year of the Rabbit blog where Flo asks more questions about auto racing and explains why she killed off one of the characters in the novel.

That's right.  Sweet old Flo killed off another character.  

Thanks for dropping by.  

T