Less than one mistake in every 6 million deliveries

I have seen recently a TV documentation about the Dabbawalas in Mumbai who deliver freshly cooked food to the workplaces and return the empty boxes back to the customer’s home. According to Wikiedia.

In 2002, Forbes Magazine found its reliability to be that of a six sigma standard. More than 175,000 or 200,000 lunch boxes get moved every day by an estimated 4,500 to 5,000 dabbawalas, all with an extremely small nominal fee and with utmost punctuality

The service is almost always uninterrupted, even on the days of severe weather such as monsoons. The local dabbawalas and population know each other well, and often form bonds of trust. Dabbawalas are generally well accustomed to the local areas they cater to, and use shortcuts and other low profile routes to deliver their goods on time. Occasionally, people communicate between home and work by putting messages inside the boxes.

This makes we wonder if we will ever reach a six sigma precision in science with all our meetings, conferences, talks, publications and reviews?? Not even using any mobile phone, no RSS and no twitter feed?