And this spirit would reign forever. So that's why they needed a place to let the Ka live, hence the pyramids. So the old kingdom, and this is again, you know, 4,000 years ago, are going to be the people that built the pyramids. And you don't have to say much to be awestruck by looking at the pyramids, but knowing that they hadn't invented the wheel, that there's no light source other than the sun, that it took up to 2 million blocks of stone to build a pyramid like the pyramid at Giza. It's going to be about 481 feet tall and these 2 million blocks, each one of them weighs roughly 5,000 pounds. And those 5,000 pound blocks, which was limestone in this case, were up to 400 miles upriver. So in order to transport 2 million 5,000 pound stones, to have no internal light source, to have no wheel, and to be able to build these 480 feet structures to house the Ka, which is the eternal spirit of the pharaoh, is pretty incredible.