You are born with about 100 billion neurons. Your "neurological network" grows more and more with each new piece of information learned. You can grow as many as 10,000 connections (synapses) for each of the 100 billion neurons you have, whenever you learn something new or form a new memory. Hmmmm...that's a lot going on up there! No wonder I couldn't remember where I left my keys this morning! ;)