Preparing for their 30th conference, neuroscientists contemplate how the field--and the annual meeting--has grown. With the Society for Neuroscience meeting routinely packing in about 25,000 people, some neuroscientists complain about long lines and related inconveniences. But others say that the best reason to go to the meeting is precisely because it's so huge and integrates the ever-growing number of subdisciplines in the field.