For a century now people have been assuming that robots will arrive and become commonplace in the home. Manufacturing has its industrial robots but helping robots in the home have not become reality. The problem is not so much being able to construct the physical aspects of a robot, it is the intelligence, the "brain", that is the big issue.
By doing 25,000 runs on a computer to build up experience, it was found that biological intelligence was structure into a network of modules. This is a breakthrough finding for artificial intelligence. Modules means alternatives can be chosen to meet a problem. This is what makes humans and animals so difficult to understand.
Apparently, all things evolve via modules. Such networks have not solely appeared out of intellectual necessity. Modules can be joined together with shorter network connections, using less to make more. Evolution is not wasteful.
In the computer simulation, once a cost for network connections was added modules were formed. Without the cost variable, there was no order to the simulation. In animals modules are seen in the brain, metabolic networks, gene regulation, protein-protein interaction and the vascular system. Even the Internet is modular.