So, did blowing into NES cartridges work?

Mental Floss investigates a mystery that has haunted me for more than two decades. 

So, dear readers, all signs point to no: blowing in the cartridge did not help. My money is on the blowing thing being a pure placebo, offering the user just another chance at getting a good connection. The problems with Nintendo’s connector system are well-documented, and most of them are mechanical — they just wore out faster than expected.