If your circular parts were actually eccentric (i.e. cams) you'd detect different peaks and troughs as the centre rotates, which would give you an insight into the radial distribution of the measuring devices?

There's an implementation of the Windows 10 calculator done in Uno (called *Uno Calc") that I use all the time on Android. It serves as a technology demonstrator but more to the point is a great calculator!

In Visual Studio 2013, if you File->New Project->Web Application, and run the result, you're presented with a page of useful links to help you build out your app. One of the links reads as below: Social Logins You can (sic) the support so that users can login using their Facebook, Google, Twitter, Microsoft Account and more. ◦ Add Social Logins ◦ Get more data about the user when they login suing Facebook "login suing Facebook" eh? Grimly prophetic, or possibly Freudian :)