Fire? Phhht ! Mankind's REAL greatest discovery.

I contend that mankind's greatest discovery in not in fact fire, though I will be the
first to admit that as discoveries go, fire is right up there with masturbation and
food. I contend that the humble Pile is in fact mankind's greatest discovery. Think
about it, it's pretty tough to make a fire without first assembling a pile of wood,
isn't it? In retrospect, it's obvious that piling behavior would be naturally
selected for, after all, a meal is basically a Pile of food. A shelter is a Pile of
materials, a bank is a Pile of money (or later collateralized debt obligations), A
book is a pile of paper etc. It is probable that the Pile also lead to the concept
of ownership and thus to armed conflict, taxes and the practice of law. Am I right or
am I right?