I have been following and using Android phones since the first public release of Android 1.5 on the Android Dev Phone 1 manufactured by HTC.
Android 5.0, dubbed “Lollipop”, is the fifth release of Android and is now available for Google Nexus 5 devices. (Android 4.4.4 source code is available in the branch tagged ‘android-4.4.4_r1’ on android.googlesource.com, part of the Android Open Source Project (AOSP).)
There are also the Firefox OS and Jolla mobile platforms for phones, but I haven’t tried either yet. These are at least four different operating systems for phones now, competing with each other.
Apple’s iOS is a proprietary software platform built on a proprietary hardware platform, Apple’s proprietary hardware, while Android, Firefox OS and Sailfish OS are source code platforms.
Long live source.
I enjoy walking to and from work as exercise.
I just don’t have time for the gym or lifting weights.
I am reading the linear algebra book “Google’s PageRank and Beyond – The Science of Search Engine Rankings” by Amy N. Langville & Carl D. Meyer on the math behind Google’s search engine.
In Chapter 4 the PageRank equation is presented.
$\pi^T = \pi^T ( \alpha S + ( 1 – \alpha ) E )$
PageRank on Wikipedia.