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Did you know...

• ...that the Antlion caves from Episode Two were originally to appear in Half-Life 2?

• ...that security cards were originally to be used around Black Mesa?

• ...that the cake is not a lie?

• ...that the G-Man briefcase contains 3 pencils, 2 scribbled sheets of paper, a handgun in a holster, an identity card and a portable computer?

• ...that the rules of the swimming pool in the Level 3 Dormitories' Aquatic Center are "No running", "No horseplay", "No food or drinks", "No smoking", "No glass containers", and "No nudity"?