Android Police noted that Google’s Nexus 7 tablet has an interesting, unbeknownst capability—until now. On the left side (so opposite of Apple):
A curious owner of the device started doing what any totally rational person does with a brand-new tablet: expose it to magnetic forces. The results yielded an as-yet hidden feature in the Nexus 7, in the form a magnetic smart cover sensor. Simply take a magnet and put it up against the front or back of your Nexus 7 along the bottom left-hand side while in portrait mode with the display on and the above happens.
Case makers take note!