>My Nexus 7 has a pop out cover, yet when it fell in a stream of running water, it never even shut down. Opening it revealed only two small drops of water. Plus

>My Nexus 7 has a pop out cover, yet when it fell in a stream of running water, it never even shut down. Opening it revealed only two small drops of water. Plus, battery contacts don't corrode from a short exposition to water (otherwise, so would the headphone plug). I have a Nexus 7 as well and I have no idea what this pop out cover means. Can you please help me understand? Thanks