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I was certainly surprised this week to learn about the high percentage of our neurons that merely communicate with other neurons. I think when we tend to think of neurons sending signals, we automatically think about motor and sensory neurons as being important. These, after all, are the outputs that we can really experience and feel. It is interesting then to learn that 99.9999999% of our neuron activity occurs between two neurons rather than to an external source. This brings up how little we really know about our own brains and how our bodies function. The fact that so many signals are necessary without our even knowing about them or sensing any sort of reaction from them shows the true intricacies of the nervous system.