Do-It-Yourself hacks around the house
Gluing a neodymium magnet to your finger will enable you to feel the magnetic field in various devices (motors, AC adaptors, power cords etc.).
Super-glue can be stored for years if put in a ziploc bag in the freezer.
Super-glue or Elmer's glue can be easily removed (e.g. from skin) with acetone.
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