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The Fact Sphere speaks like a stereotypical "know-it-all", spending most of its time rapidly rattling off various facts. While a small portion of the listed facts are, most of them are and downright . (Sometimes altering into )
The Fact Sphere, along with all the corrupted cores, is voiced by Nolan North.
- The Fact Sphere was the only corrupted core that did not go to space when Chell opened a portal to the moon.
- In the unused audio files, the Fact Sphere can be heard yelling at both the Space Sphere and Rick. This could have used for three things: when they are in the cage right before the boss fight begins, while on the central core body, or both it and Rick were going to be in the ending cutscene.
- In the Portal 2 subtitles, its name was listed as core 3.