It likely wasn’t done on an electron microscope, or at least there is no reason to. There is no scale bar, but quick look online tells me a very fine needle is about 0.016in. 500x magnification optical lens would give you more than enough resolution for a photo like that.

Anyone else just use the plastic net that onions come in until it gets gross?

Samsung Fridge/Freezer. About every spring and fall, our fridge freezes over in the cooling system. The ice builds up and blocks the fan which stops circulation so that the fridge warms up and spoils all the food. Samsung says there is no major issue but it seems to be common flaw talked about online. The fix is to take apart the back of the fridge and remove all the ice. One constantly on of the edge of buying a new one.