Dunbar's number

I recently listened to an NPR piece on Dunbar's number.  Essentially Dunbar's number is the number 150, and it represents the number of stable social relationships we can maintain.  For example, when companies have over 150 employees, employees no longer know everyone and can remember them by name.  This is also the number at which smaller hunter-gatherer societies max out, and so on.

When we live and/or work in communities larger than 150 people, there are social consequences.  Listen to the 5 minute NPR piece.  Very interesting!