Even though he's still working to achieve his goal of six-pack abs -- he feels and looks like a completely different person.

CNN: College professor goes from fat to 'Mr. Low Body Fat'

Since the time of the cavemen ("How Kill Mammoth, " "How Make Fire"), these celebrations of self-sufficiency have run the gamut of topics, from carpentry and social etiquette, to stock picking and six-pack abs.

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With the sets of basic specifications and features set in stone, HTC's engineers can then offer the right phone sizes that meet the carriers' requirements, as well as showing a relatively bland rectangular ABS block as an indication on how much space is needed to pack all the components.

ENGADGET: HTC talks smartphone design: from inception to final product