RE: [OT] Alien Figures

G'day,

>If we are talking Aliens
>(i.e. the film) then in the first 
>one the motion sensor was based on
>changes in air density (if memory 
>serves correct). So presumably
>just moving through an atmosphere 
>was enough. (i.e. don't fight in
>a vacuum :)

OK that makes sense... though how they're on movement doesn't set it off
may
be an interesting question.

>Also how about if motion detectors 
>were based like some animals
>in picking up electrical discharges 
>from muscles when they are used.

In an air based medium you'd have to be REALLY close to detect that I
would've thought, would work well in more aqueous media though.

Thanks