1st trip to the future, 1 million years

I have landed in an Earth, although it is strange. The inhabitants of this Earth have abnormally large heads and brains compared to humans I am accustomed to. Their heads are at least four times as big as their bodies. They have a very small torso, along with skinny and shrunken useless arms and legs. The "humans," I'll call them the brain people, use levitating chairs to transport themselves everywhere; I'm not even sure they can walk on their own. These chairs manage every small task for these people: going to the bathroom, getting dressed, etc.. The brain people are extremely intelligent; they're like living computers! It seems as though the brain people have evolved out of the need to use their bodies, and rely only on intelligence. They're society is extremely technologically advanced. It's quite amazing.

Upon investigation, I found that about 500,000 years ago humans developed a way to create wormholes in space, and transported a large number of people to a new Earth, in a very similar alternate universe. The descendants of the brain people took over, killed the ancestors of what would become humans, and effectively turned alternate Earth into a human colony. After a couple hundred of years, a rebellion occurred, and the link between the two universes was destroyed, separating Earth from the alternate Earth forever. The brain people evolved on a different but similar Earth. My guess is that original Earth humans are probably similar to me, a regular human. These brain people evolved in a different geographical location.