Film storage

MattKing said:

Aluminum foil may not protect you from cosmic rays, but if you make it into a hat, you can probably find lots of room for yourself on the bus.

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Yes, aluminum foil makes an excellent hat.

"Cosmic rays" are not electromagnetic radiation but particles. The higher energy ones pass through the entire planet, so a piece of sandwich foil really isn't going to help very much. The underground vaults mentioned also have a very constant temperature and humidity which probably reduces storage costs considerably.