[njharman]

I find it amazing HN readers believe walking is a trivial task.

[jrp]

The key word being "apparently".

[seldo]

I don't even think it's that apparent. It takes us 2 years to learn to walk, even with millions upon millions of years of evolution designing us perfectly to do it.

[demallien]

Yes, but many four-legged animals can walk mere minutes after having been born, and this is a more valid comparison for the task facing a four-legged robot.

[cma]

>even with millions upon millions of years of evolution designing us perfectly to do it.

Birds can walk on two legs in very little time.