According to studies, the sun will be the major reason for skin aging. This aging process is properly called 'photoaging'. The sun emits different regarding UV rays. They're UVA, UVB and UVC rays.
That was the plan, anyhow, the one Valve have not kept considerably as. Episode 1 was released in June 2006 (2), but Episode 2 does not ship until October 2007 (3), and Episode 3 has no release date, let alone any more released materials beyond concept art.
So will this all mean…
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