Ancient Stone Tech
Egyptologists and archaeologists the world over insist that megaliths are the product of many hands using primitive tools over many years. Intervention theorists disagree. They believe it is absurd to suggest that primitive people using fiber ropes and stone tools somehow cut some of the hardest stones on Earth, and built giant structures with a level of precision we could not match today.

Consider the stonework at Sacsayhuaman (sac-say-wha-mun). When stone is cut, whatever tools are used will leave marks of that use. The stone can be polished smooth to a certain extent, but at a microscopic level it is still easy to determine what method was used.

This is because stone is composed of multiple elements which all cut differently, and due to different levels of hardness, all of it can't be polished to the same exact level. The Sacsayhuaman stone is granite, a hard stone which contains 15-30% quartz. Quartz has a Mohs hardness scale rating of 7. A steel file is only rated 6.5 (Diamond is 10). Not an easy job for a stonecutter supposedly using stone tools.

In an excellent article published in Ancient American Magazine, author Laura Lee described her discussions with Dr. Ivan Watkins, a Professor of Geology at St. Cloud University in  Minnesota. Lee reports that "The methods that are supposed to have been used by the ancients, such as pounding, hammering, grinding, polishing with abrasives, and wedging, just don't match up with what Watkins sees under the microscope."

Hard rock hammered in the manner proposed by Egyptologist Mark Lehner, and others, will shear along the natural grain of the stone, and the minerals are unevenly fractured. When granite is polished, the softer elements in the rock wear down first, leaving microscopic and near microscopic quartz crystals protruding. When a "wedging" technique is used (when a wedge is fed into a crack or groove in the stone and used as leverage to fracture it), the direction of the fracture can't be controlled.

None of these things are observed in the stones at Sacsayhuaman. Instead, the stone is smooth, microscopically slick and even. The explanation given by Watkins is that heat can melt quartz fragments into a glaze that fills in the irregularities, like a ceramic glaze. The exact same sort of "melting" effect  produced by modern "thermal disaggregation" technology, essentially the focused heat found in lasers, which can be used to cut stone. Each pass of the laser only shaves off a couple of millimeters, but with multiple passes the stone is cut in a straight line, leaving a slick, smooth surface eerily similar to the supposedly Incan stonework.

Therefore, in the language of the Deep South, only one question remains: Who are you going to believe? Lehner and his colleagues, or what your lying eyes tell you?