It's an evolutionary imperative.

Model

Model

Model

Model

So in evolutionary scales, movements get better.

Color Model

Chart model

Keyboard model

Atom Model

Camera Model

Printer model

Printer Model

Color Model

Unspecified Model

A model.

Model, hot...

Eventually, the new model will replace the old model.

Set iPod Model

Set iPod Model

Current color model

Printer Model Selection

New model cars.

Different model, right?

She's a model.

He's a model?

She's a model!

Some role model.

A nude model?

Um, nice model...

A MALE MODEL.

With the model.

A role model?

Model B is the exact same length as Model A.

Well, you know, the people who are most skeptical about leaping to evolutionary explanations for everything are the evolutionary psychologists themselves.