do u believe aliens helped in building pyramids?

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Do u believe that aliens helped humans to build pyramids coz they were built when wheel was not invented.so, how people of that time brought big stones from distant places and made them so much accurate and fine even a hair is difficult to slip in between stones of pyramid?!! 'm not sure I believe it totally..it could be a possibilty, but I've read that the stones were probably sent over the nile river while they were slid upwards with the help of ramps and inclined planes constructed along the pyramids and ofcouse all the numerous workers there. But the accuracy with which they were made and the sheer size of these pyramids makes me think about the alien theory...and the question still remains unanswered...:) i guess math was not that much perfect that time to bulid pyramids so perfectly and it was not possible for man kind to work so many years on a single thing what are your views on this ?