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August 1, 2025
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jan 1, 1986 - Aperture Science find out Black Mesa is working on similar portal technology. (ApertureScience.com)

Description:

- 1986
- The Conversion Gel Testing Facility is updated with an additional wall.
- Word reaches Aperture Science management that Black Mesa is working on a similar portal technology. In response to this news, Aperture Science begins developing GLaDOS, although the name was already in use in 1982.

Added to timeline:

Date:

jan 1, 1986
Now
~ 39 years ago