RFID blocker

Maybe I am just overly paranoid, but these days RFIDs are everywhere. They're in your credit cards, your cell phone, employment badges, public transportation passes, electronic toll booths, retail packaging. They are used to find lost pets, track livestock, and in some cases implanted in you.

If you are worried about someone stealing your identity or credit card information using a RFID reader, here is a simple trick for you:

Cut a piece of aluminum foil about the size of a dollar bill, and place it in your wallet. When your wallet is folded up in your pocket, any credit cards or ID badges wrapped inside the foil will be impervious to an RFID reader. I experimented at work, and sure enough my proximity card won't open my office door if there's a sheet in aluminum foil between the card and the reader.