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

Easy, you have to attach the string to one of the two pieces, then you grab the string and leave the iron piece since It stops moving. If you chose   the magnetic one, there you have a Compass. Now, try to move the iron, and if It comes back to it's initial position , you can figure out wich is wich because of the Earth's magnetic field.