r the story lines of portal and portal 2 diff

Aperture Science constructs the elevator out of the Propulsion Gel Testing Facility.Cave Johnson receives the answer to a confidential letter titled 'Human Enrichment & Testing Initiative, Resource Acquisitions', describing the four types of Test Subjects and their behavior.Aperture Science constructs Chamber 05 of the Propulsion Gel Testing Facility.This date is the earliest known use of a bulletin board system by Aperture Science.Aperture Science constructs at least Chambers 01 and 02 of the Propulsion Gel Testing Facility.Aperture constructs Pump Station Beta and begins Propulsion Gel testing.The lower sections appear to remain unused.

Aperture Science re-opens Test Shaft 09 for testing.

Cave Johnson says that Black Mesa has stolen and remade many of Aperture's products. By now, Aperture Science has gone black bankrupt.

Aperture Science is involved in US Senate hearings regarding 'missing astronauts'.

Aperture Science's Test Shaft 09 'Zulu Bunsen' is condemned and sealed off.

Aperture Science constructs Test Shaft 09 Chambers 27 and 28.

Aperture Science constructs at least Test Shaft 09 Chamber 26.

Pump Station Alpha (which pumps Repulsion Gel) is in active use by now.

The Eisenhower administration signs a contract with Aperture Science to manufacture shower curtains to all branches of the US Military, except the Navy.

Aperture Science receives the Spirit of Idaho National Potato Board award for the promotion of Potato Science.

Aperture Science is the Runner Up for the US Department of Defense's Contractor of the Year award again.

Aperture Science constructs Pump Station Alpha and at least Test Shaft 09 Chambers 01 and 02.

By now, Aperture Science has begun testing Repulsion Gel.

Aperture Science is the Runner Up for the US Department of Defense's Contractor of the Year award.

It is during this decade that the Black Mesa facilities are probably built, before being purchased and refurbished later by Black Mesa (several Half-Life texture files names contain the word 'fifties', suggesting the facility is as old as from the 1950s).

Aperture Science is rated #2 among the Top 100 Applied Science Companies by the Mechanical Engineering World Journal.

Aperture Science receives the award for Best New Science Company from the Science and Business Institute of America.

Cave Johnson appears in the UP Pioneer Press headlines for buying a salt mine in Upper Michigan, which is later reconstructed as the Aperture Science Innovators facility.

Cave Johnson receives the Shower Curtain Salesman award within Aperture Fixtures.

R the story lines of portal and portal 2 diff