If you are afraid your friends, kids or any other person you are borrowing your iPad to, might delete an app by mistake or even intentionally, you can enable restrictions on individual all of the apps.
PIPA team working on a fingerprint authentication for basically anything. Take a look at this promising project that still needs your funding to go into the production.
Lime scale is often found as a similar deposit on the surface of pipes and other surfaces where "hard water" has evaporated. In this lesson I will show you how to clean it.
