thanks! I've fixed it.
smq
Since portals aren't real, maybe we can start from what we see in game: Chell can hold it for long periods of time without problem, so that puts an upper weight barrier on it. Aperture must've figured out a way to fit portal technology into it, or found a way to stash its mass away. Or maybe it's heavier than average, but Chell is drugged to be able to hold it.
There's no power cord in-game, so its energy source must be self-contained, because I don't think it can get enough power by absorbing things in the air.
not sure about standard, but privacyguides.org has some nice resources for getting started. I recommend their "threat model" resource in particular; it shows you what direction you should work towards depending on your privacy goals.
Privacy Guides has an Android page as well.
Sorry for your struggle but that's interesting; the ants must have some sort of detection system to figure out when there's cat food. Maybe they send a scout ant every day. Maybe they can smell it from inside the walls!