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This is the timeline of the Portal and Half-Life universe. Warning, contains spoilers, especially under the 2000s section.

1900s

1940s

1940

Aperture Fixtures founded

1944

Cave Johnson buys a salt mine in Upper Michigan, and renames Aperture Fixtures to Aperture Science Innovators.

1950s

1950

Black Mesa founded

1951

The Mobility Gel Project started; Repulsion Pudding was renamed Repulsion Gel

1953

Pump Station Alpha constructed, Repulsion Gel testing starts

1960s

1961

Test Shaft 09 sealed off

1968

Aperture Science goes bankrupt

1970s

1970

Propulsion Pudding is removed from the shelves

1971

Aperture re-opens upper levels of Test Shaft 09

Pump Station Beta created

Propulsion Gel testing begins

Aperture now tests hobos for 60$

1976

Gordon Freeman is born

1980s

1981

Aperture now tests employees

Cave Johnson buys 70 million dollars of moon rocks; is poisoned

Conversion Gel created

1982

Cave Johnson names Caroline as his successor

Pump Station Gamma created

1984

Adhesion Gel tests started

1985

Adhesion Gel tests abandoned in favor of Ditto Gel

1986

Ditto Testing Center built

GLaDOS created

1987

Cave Johnson dies

Borealis lost at sea

1990s

1990

Canister Core Project started

1995

Intelligent Ditto Gel created

1997

GLaDOS is now v3.11

1998

Excursion Funnels, Aerial Faith Plates, Thermal Discouragement Beams, and Pneumatic Diversity Vents created

2000s

2000s

2003

May 13
12:00 PM

GLaDOS activated, the neurotoxin flooding; Morality Core installed

May 15
8:58 PM

Black Mesa Incident

2010s

2015

Chell awakens

Chell defeats GLaDOS for the first time

2020s

2023

June 29
11:46 AM

Gordon Freeman is taken out of stasis

2080s

2087

Aperture Science 2.0 founded

2100s

2100s

2106

Aperture Science 2.0 raids Aperture Science facility; finds Doug Rattmann in stasis and moves him

2160s

2163

Doug Rattmann reawakened

2167

Chell awakens for the second time

GLaDOS is awakened

Wheatley takes over the facility

GLaDOS takes back control of the facility

Chell escapes

2168

Aperture Science 2.0 abandoned

2170s

2176

(portal 345 events TBA)

2177

(portal 6 events TBA)

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