A software engineer, a hardware designer and Bill Gates are driving in car on the freeway. 
Suddenly the car breaks down, the engines stops. 
The software engineer says: “I think that car ran out if gas. 
Let’s walk to the nearest gas station and get some gas, put it in the car and then it will start again.” 
The hardware designer says: “I think the muffler broke off, let’s fix it and then we can go on. 
“ Bill Gates says: “I’m not sure what the problem is but let’s close all the windows, and then try restarting.”