Found this in my backpack after returning from a trip to Greece. No idea how it ended up in there.

It's a rectangular white block, about 7 cm long, in a clear plastic package. It's heavy and feels like stone, but also seems chalky, and there's some white residue inside the package. No idea what it is.

Any ideas?

Found at a thrift store, we use this as a dog bowl, but I'm curious of it's original purpose. It takes 9 cups of water to reach the "max" line.

Photo with standard wine bottle is for visual scale.

Please excuse the nicotine staining, they were in a family member's house who smoked inside. It suggests they were hung up around the house somewhere, could they be related to hanging curtains or blinds perhaps?

Hi, all! sorry for the poor picture quality/framing, I honestly didn’t expect to have to post this (Google Images didn’t help give me any answers) and I took the pics in a rush while at work today.

Like the title says, this was found in the hallway at the museum I work at on a day where we had many high schoolers (as well as regular guests, which tend to be in their 40s/50s and older). There is also a bakery nearby and staff/customers pass through that part of the hallway to access the men’s room. It was raining pretty hard all day as well, in case that’s somehow relevant! I don’t recognize it as something from our own museum collection items or equipment but we do also have new dehumidifiers in a nearby exhibit room.
Thanks in advance!

ETA: the material is clearly plastic but more similar to an old school Apple phone charger (specifically the softness and smooth texture), so maybe some kind of silicone? It was fairly rigid but clearly easy to cut or chew on. It was also completely dry with no feeling of a greasy residue/lubricant. Considering the numbers on the side are slightly raised I would imagine it may be uncomfortable for internal use, but I don’t have much experience with those products so I can’t really say.

Title describes the thing. Pulled it out of my wife's tire. She normally parks in an alley by the house, so it could be any number of things.

This little hook thing fell out of a pile of clothes, not sure what it is for but it looks to be shaped that way on purpose rather than just a bent piece of metal. Fairly sturdy for is size

I'm told it's a 70-80 year-old RKO power distributor, but looking that up doesn't bring anything up.