Can you solve the MAGNET RIDDLE? ft YouTube CEO Susan Wojcicki

Other solutions, grind bits of them down with the file, the one that has some of them stick together is magnetic. The other is not. Tie it to a string and see if one tends to rotate in a specific direction. Have a magnet implanted in your skin before hand, use your ability to detect magnetic fields to tell which is magnetic. Find scrap of magnetic material in office drawer, use that. Place magnet on hard drive of youtube servers. This isn't a test they just really need to start over from square one.