"Little ring-shaped spots of something growing[?] on expired Reese’s Peanut Butter Cups."
A: "Quite possibly “fat bloom” which is fat from the cocoa butter migrating to the surface of the chocolate. Can happen as chocolate ages or with a change in temperature.
"They're oil absorbing pads and since oil floats on water the tube is there to stop the oil from flowing while letting the water pass under it"
I had to visit reddit to look it up... I feel dirty.