What is a good ancient artifact from Egypt that is one of their technology advances?

Answer 1

Well, if you buy the argument that the Egyptians had light bulbs, then I would go with that! But if you want to stay on this planet, then probably the use of faience, a beautiful kind of blue pottery that the Egyptians perfected and which is still considered quite tricky to reproduce. They also built sailing ships, and of course they did good surveying... including the surveying at the pyramids, etc where there is some evidence that they demonstrated a pretty good undertanding of the value of pi... although there is no reason to buy into the fringe science about the pyramids being power generators.

Answer 2

Conventional INfo:
The Egyptians invented and used many simple machines, such as the ramp and the lever, to aid their construction processes. Egyptian paper made from papyrus and pottery was mass produced and exported to the entire Mediterranean basin.

There are always sphinxes and pyramids, which are far more complicated than many believe.

Then there is a lot of controversial info. Such as...

One of the classic reliefs from the Temple of Hathor that clearly show various forms of what is now known as the Crookes tube, a form of light bulb, being used to shed illumination. Some believe that this is how the ancient Egyptians were able to paint the tombs deep underground without the use of torches, which would have left telltale residue. The number and variety of the lightbulb images is more suggestive of a research facility, making the Temple of Hathor possibly more of what we would consider to be a laboratory than a house of worship.
Image from Conscious Evolution

Egyptian Ven de Graff
Image of an Egyptian Van de Graaff generator. Isis and Nephthys at the bottom sit on the sign for gold, nebu, which is a superior power conductor. The djed column means stability, acting as a stable base for the generator, the term possibly also meaning "insulator" in this context. The ankh means the power of life, or electrical power. The round symbol is the solar disk, or a source of light, as the case may be. The current understanding of the ankh and solar disk as merely symbolic of life is the result of a degeneration of ancient Egyptian thought, where superstition had taken the place of science.

Christopher Dunn in his seminal The Giza Power Plant argues very convincingly that the Great Pyramid of Giza was originally used not as a tomb, but as a method of generating energy, in effect, making the Giza necropolis the shattered remnants of an ancient "power plant".

The huge trilithons of the Valley Temple are simply two massive blocks surmounted by a third massive block — literally, the simplest possible method of construction. At hundreds of tons each, however, the question remains as to how they were lifted into place, as it would be difficult or impossible to perform the same feat today.

FOr more interesting info try
http://www.mysteriousworld.com/Journal/2003/Summer/Osiria/

Answer 3

How about the Archimedes water pump..still an important irrigation devise used widely by the Nile

Answer 4

The sacred cord, for making measurements and angles.