Wow, a couple non-retarded questions in a row! Since I appreciate that, I will give you a non-retarded answer.
You know how slow contractors are today right? Well they were far worse back in 3100 BC. See Stonehenge was not built by 3 groups over a long fucking time, but only because they were lazy mofo’s. Stonehenge I, had a circular henge with an entrance to the NE closing (which was probably a porta-potty to get the contractors to get "shit" done). A tall wooden archway set 65 feet away from the entrance. The fifty-six evenly spaced holes, or Aubrey holes, named after their discoverer, surrounded the porta potty, concentric with ditch and bank. The builders filled them in almost immediately because they were too bloody cheep to finish the plans (of course much later they were dug out and filled with creamated human remains!). Then there was the Windmill Hill people who were called in to help, and they used tools made from oxen bones and antlers to help get shit done, but upon some guy making a huge mess in the porta potty they too were fired.
So now it’s like 2150 BC and somebody goes. FUCK… We really need to get that shit done. So comith the Beaker people. Those guys wanted to impress the chicks with their big muscles so they thought they could get the project done better with some BAR’s (big ass rocks). They went across some water and pulled those BAR’s on wooden sleds over some BAL’s (big ass logs) until they got to water where they transfered the BAR’s to rafts. Ok so because of those Windmill Hill people, the Beaker Hill people didn’t have a porta potty to work with. So they decided to dig a shit ton of holes in the ground so all the workers could have their own place to take a squat. They also realized the usefulness of fecal matter as a cement agent and they tossed a bunch of bluestones in those holes after the workers went #2.
Having all got sick from their dumb ass holes filled with methane, they quit working on the project and another group was hired to get the job done. The Wessex people. The Wessex decided the Beakers didn’t know what the fuck they were doing and that their BAR’s were not big enough. So they went 20 miles away and loaded their SUV’s (stupid uneducated vigilantes) up with this hard ass sandstone shit called sarsen. The SUV’s had pretty good traction control so they had them slide the sarsen over ice to get it back. Then later they had one of the QECG’s (queer eye for the caveman guy) come in and finish off the project and adding such small touches as putting a single blue stone fragement in each hole to give it that mysterious, sex and power look they were going for.