The Greatest Invention

What is the greatest invention of all time?

From paper to flying aircrafts to automobiles to television or even the World Wide Web, one invention has stood against all others in the face of time. Even as science advances by leaps and bounds, there is one invention that is still very much in existence despites more advanced models appearing in the market. What is it?

Its the INCANDESCENT LIGHT BULB! at least in my opinion.

Invented in 1879 by US renowned scientist Thomas Elva Edison after over 100 failures, the incandescent light bulb is still very much in use today without much modification from the first successful prototype developed by Edison. You can hardly find a place on Earth inhabited by Man yet find no signs of the incandescent light bulb. Even in developed Singapore with many people using the more economical fluorescent light bulbs in homes, you can still find the incandescent light bulbs somewhere, be it the bulb in your storeroom, toilet, your car's front headlights or even that very tablelamp you bought from IKEA could well be using incandescent light bulbs. You must praise the brilliance of Edison to come up with such invention that stood against time, against the advances of technology, after more than a century, the incandescent light bulbs we have are still very much similar to the original ones he made. It could well be because of his more than 100 failures that made his invention survive until now.

As I was searching for some info on the Incandescent light bulb by Edison, I stumbled upon something interesting. The invention of Jeans was actually by Levi Strauss and Jacob Davis back in 1873.

Anyway could anyone tell me the difference between the normal Levi's shops and the Levi's Strauss shops?