Although Android has long featured Easter eggs, having started with the 2.3 version named Gingerbread, one of the first playable secrets is found in Android's 5.0 operating system, named Lollipop.

Android phones were a jumble of clunky menus and mismatched designs in Android KitKat. Then came Android 5.0 Lollipop, a sugary-sweet update that transformed the mobile landscape forever.

Android 4.0 also made swiping a more integral method of getting around the operating system, with the then-revolutionary-feeling ability to swipe away things like notifications and recent apps.

It started life as Android L preview in June, but it has since matured into a full-blown release, ready to hit millions of Android devices over the next weeks and months. Android 5.0 Lollipop is here!

Follow Android's journey from its roots as an unknown underdog to launching Google's PC and mobile OS, which equals or exceeds any top-tier mobile platform.

Interestingly, the Android operating system was not initially designed to be used on mobile phones. If the original plans of the inventors worked out, we would be talking about smart cameras and ...