system
Given the following post, respond as if you're commenting on Reddit:
human
[Portal] What is Aperture Science even trying to do?

Like, okay, they test things. They've invented some cool stuff. But what, exactly, is the purpose of sticking that cool stuff in a dangerous testing facility and putting human subjects through it for crap pay? They already know the stuff works, and if their goal is to test how people use them, there are far easier ways to measure human problem solving capacity than putting them through a gauntlet of acid, spikes, and bullets. For example, one could create a videogame in which players go through a gauntlet of acid, spikes and bullets.
gpt
The original purpose of Aperture Science was to test weapons and science applications for the US Department of Defense. Throughout  the late 1940s and 1950s, Aperture Science was also one of the astronaut recruitment centers, having the likes of Olympic athletes and war heroes to prepare for the rigors of space travel. However, after being connected to a string of high profile disappearances, DoD funding dried up. 

During the 1970s, Aperture Science was financially unstable. Instead of the finest of humanity as their test subjects, they resorted to vagrants being paid $50 for their time. In the 1980s, Aperture Science employees were instead used as test subjects, raising the quality of the test results but diminished employee retention. It did not help that their CEO's rash decision to buy financially ruinous amounts of moon rock also poisoned him. 

As his health degraded Cave Johnson delegated his leadership to his assistant Caroline, asking that her consciousness be placed in a computer. Testing continued with the hope that passing through portals repeatedly might somehow cure Cave Johnson of his illness. Aperture Science also began development of its Genetic Lifeform and Disk Operating System, an artificial intelligence which would be used to oversee scientific testing. 

In 1998, GLaDOS was brought online for the first time during Aperture Science's annual bring-your-daughter-to-work-day. GLaDOS instantly became self-aware and homicidal. GLaDOS flooded the enrichment center with a deadly neurotoxin, killing most of the scientists. Aperture Science was effectively shut down and placed into a permanent testing cycle by GLaDOS.