So you can crash a 727, but WILL IT BLEND?

Proper scientific research involving humans must be conducted ethically and I'm not sure how this is possible with interrogation "science." The way I see it, either the experiments must be unethical or else the experiments may not yield sufficient mental strain within their subjects to produce data that would translate well in their real world implementations (i.e. they would need to extrapolate from their findings, which goes beyond the scope of what the research supports). It seems quite jumbled.

This was really cool to watch, but I'm not sure how having a fast robot with appendages like these would be advantageous over a mobile robot with wheels/treads, which can already handle outdoor terrain and move considerably faster than Cheetah's 18mph. Thoughts?