Once in a while, a remarkable app just makes us say, “Wow.” Wolfram|Alpha is one of those. Enter any mathematically related question (natural language works, too), and the app dives deep into data sets to pull out your answer, plus visual comparisons, graphs and charts. For instance? Input “moon from Hong Kong” and you get current and average distances from Earth, the orbital period and average radius, along with a graphic of its current phase and times when the moon rises and sets from Hong Kong.
Platform: Android, iPad, Kindle Fire