system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how the pyramids were built, and why there are conspiracy theories about it.
gpt
The pyramids were built using ramps and pulleys and thousands of workers who labored for decades.

There are conspiracy theories about them simply because they are old and big and unique. There are very few buildings around that are as old as the pyramids -- 4000 years. People wonder why anyone would build something as huge and impractical as a pyramid. But we simply do not know enough about ancient Egypt to explain everything about them.