![...a working prototype of the Mars Rover.
...a working prototype of the Mars Rover.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
...a working PROTOTYPE of the Mars Rover.
The Big Bang Theory Season 8, Episode 3
![we've put a lot of thought and effort
into this current prototype.
we've put a lot of thought and effort
into this current prototype.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
we've put a lot of thought and effort
into this current PROTOTYPE.
The Big Bang Theory Season 10, Episode 15
![Penny says they're having fun
working on the prototype.
Penny says they're having fun
working on the prototype.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Penny says they're having fun
working on the PROTOTYPE.
The Big Bang Theory Season 9, Episode 19
![we've put a lot of thought and effort
into this current prototype.
we've put a lot of thought and effort
into this current prototype.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
we've put a lot of thought and effort
into this current PROTOTYPE.
The Big Bang Theory Season 10, Episode 23
![that allowed us to get the size
of the prototype down to the target specs.
that allowed us to get the size
of the prototype down to the target specs.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
that allowed us to get the size
of the PROTOTYPE down to the target specs.
The Big Bang Theory Season 10, Episode 15