Our presence would be found more easily due to the population of the human race right now & the sheer number of places we have left our mark.

Back then the population was small.

there's so much fail in the OP...

it's amusing in it's own right how much nonsense people believe in order to give some excitement to their own lives :)

The fact that they used something, or that something (those jars) have an alternate use doesn't mean that they know everything about it.

What will think those that find the remainings of our civilization thousands of years later when they find this?

http://www.neatorama.com/2006/11/30/uranium-glasswares/

Or hatters using mercury.

Accomulated sugar can be used to produce electricity. Does this mean that indians discovered piezoelectricity 500 BC?

Heyyy that looks a lot like the things the Gungans were fighting on in The Phantom Menace.

George Lucas the greatest visionary ever re-confirmed?????!!!!

My childhood....

Another theory:

Why should he? one of the best shows out there

Thats exacly what i meant woith my first post last night but was to tired and angry to make it better coherent.

There are some civilisations that said we were in the 6th or 7th cycle wich could mean that we humans have done this 6 or 7 times so far.

A few years back I was watching a show that discussed religious machines in ancient Rome. These were machines that were supposed to create "miracles" (for lack of a better word) inside of temples to show off the influence that a god had there. While a lot of these machines were very simple, a few wooden balls inside a box that was on something that looked like a teeter totter for simulating thunder, some of the machines demonstrated a sophisticated understanding of physics.

The reasons why the industrial revolution only happened a couple hundred years ago, rather than in the times of Ancient Rome, was because of cultural reasons not lack of understanding of machines. They had all the knowledge they needed to build a steam engine but the information was spread across multiple secretive religious cults and there was no reason to build a steam engine in Ancient Rome.

It is the improved sharing of information because of the renaissance and the increased personal freedoms (and property rights) that started the industrial revolution. Before that, people were doing a lot of advanced things but a ton of effort was wated re-discovering what someone else already discovered; and lots of discoveries could be easily lost due to a plague or war.

Define advanced technology.

There is a lot of advanced technology ancient peoples had that were lost.

Batteries, Germ Theory, Eye surgery.

Greeks had all kinds of weird mechanical steam toys.  Heron's theatre and all that.

Or that one doctor in Chinese history/myth that knew about cancer during the "Romance of the Three Kingdoms" era.

Ended up killed by Cao Cao, forget his name right now... Hua Tuo?

People were a lot smarter and more advanced back then, then we give credit.

Hell people think ancienet people generally thought the earth was flat... when anyone who lived near a body of water no doubt knew otherwise, watching someone sail over the horizen.