system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 Why can't bipedal robots walk like a normal person?
gpt
It is because walking upright is actually a very impressive thing.

To be able to walk upright on perfectly flat terrain is easy, but to be able to immediately adjust to a thousand permutations of incline, materials, stability, etc. is actually very hard.  The human foot actually has more bones in it than any other part of the body - when combined with the number of other organs and systems we have dedicated to _balance_, the process of walking upright is an amazing interplay of systems effortlessly working together.

We are getting closer with robotics, but it is still a very complex engineering process to get right.