Veritasium - How Were the Pyramids Built?

Short Summary

Main recommendation: The pyramids were most likely built by professional workers using sledges with sand sprinkled in front, copper tools with abrasive sand, and a ramp that circled the pyramid rather than a single straight ramp, though no plans survive to confirm the exact method. The video argues the slave-built myth is unlikely because well-preserved tombs near the pyramids suggest the builders were rewarded professionals.

Key Points

• The Great Pyramid was the tallest man-made structure for about 4,000 years, until the Eiffel Tower surpassed it in 1889 at 147 meters.
• The builders had no wheels or iron; the only metals available were copper and copper alloys.
• Roughly 2 million blocks of 1.5 to 3 tons each were used, with construction taking about 20 to 30 years, requiring placing a block roughly every 3 minutes over a 10-12 hour workday.
• Recent evidence of honorable tombs near the pyramids suggests the slave-labor myth is unlikely, though this is presented as an inference rather than definitive proof.
• Granite for the exterior was quarried in Aswan, about 1,000 kilometers from Giza, and likely floated north on rafts during the Nile flood.

Details Worth Noting

• Concrete instructions: Move heavy stones by dragging them on sledges and sprinkle sand in front of the sledge, which experiments suggest can cut the pulling force needed by about half.
• Concrete instructions: Cut limestone with copper chisels and copper saws, adding an abrasive such as sand to make copper effective on stone.
• Concrete instructions: Level the building ground, possibly by using Nile floodwater in channels to reveal high points.
• Concrete instructions: Build with a ramp that circles the pyramid, since straight stacked ramps would use more material than the pyramid itself; levers were likely used for the upper layers, which contain only about 4% of the material.
• A famous drawing shows a colossal statue being pulled by 172 men; the statue may have weighed around 68 tons or so, according to the speaker.
• Granite is very hard (quartz hardness 7 on the Mohs scale, versus diamond at 10); quarrying was done by repeatedly crushing dolerite against it, advancing about 5 millimeters per hour.
• The pyramids were originally covered in white limestone, with possibly an electrum (gold and silver) capstone.

Bottom Line

The pyramids were most plausibly raised by skilled, paid laborers using sledges, sand, copper tools, circling ramps, and levers, though the exact construction method remains unconfirmed.