“My friend has found a bunch of these weird little plastic things while cleaning up the beaches in Maine. We have no clue what they are.”
Answer: "These are aquarium filters."
I think it might be the 95th time I have seen that picture on this site, and yes, old toothbrush :)
Yeah, how could a sponge be used for RFID?
Yeah, Izi, we've been over this before.