Merry Christmas, or whatever you celebrate!
Or if you don't celebrate anything, happy normal Monday, I suppose?

Scientifically domestic ChristmasGLaDOS didn't like Christmas.Scientifically domestic Christmas by ~Lieju
Not that she disliked it either, it wasn't particularly important to science, but it didn't tend to interfere with it either.
Her internal calendar had always kept her informed of the date, but she hadn't paid holidays any mind. Testing had been far more important.
No, testing was still the most important.
But now there were…
Other things to consider.
This was the first Christmas she'd be spending with Chell and CaTHY. Last year had been the first Christmas after she had replaced [TEST SUBJECT] with 'Chell' in her official logs and files, but back then the human hadn't yet lived in Aperture.
She had spent

Domestic Science"CaTHY, I'll tell you a story."Domestic Science by ~Lieju
The cyborg looked at her mother (or one of them), interpreting her hand-gestures. Her human mother had insisted they didn't upload that skill to her memory banks so that the girl learned sign language the old fashioned way. GLaDOS had called it ridiculous.
"CaTHY is not old-fashioned, like you. She is an improved version. True, her DNA might be mostly based on you but you might notice the cybernetics? She lacks your limitations."
However, she hadn't included it in any of the language-updates she had downloaded to the mechanical part of CaTHY's (Cybernetic and Technological Humanoid Youngster) brain.
"I know sto