It is said that......

If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee.

I have two schools of thought on reading this.
My first inital thought which came to me instantly when i first read this was, ha! i wonder if anyone is dumb enough to try it to find out if really works.

The second was that yelling or producing noise or sound is a very good way to produce energy. Of course, as can be seen from the above interesting fact, it isnt exactly the most efficient way. BUT, it is still a way. Plus the fact that sound is the easiest energy in the world to generate. I remember studying chemistry (i think it was the chapter on fuels) and thinking that if we could somehow harness sound energy produced and translate it into a form of energy we could store and use. Then, i'd think that we'd have just found the world's most renewable source of energy.

BUT.

Of course, life is never that simple.
I am sure someone else out there has thought of that before and found it unfeasible and thus, here we are still stuck with the good ol fossil fuels. Burning it up, and polluting the planet.
Sigh.