You are trying to install or open an app that didn't come from the Mac App Store but you got a message saying App can't be opened because it is from an unidentified developer. This is how you bypass it.
Mail merge is one of the most useful features of Microsoft Word when wanting to send personalized letters, documents or e-mails to people you have stored in an Excel sheet. Let me show you how to use it.
MTT-136 - My Track Technology is an astonishing and persistent little electric powered, tracked vehicle. This thing can run in mud, grass, deep fresh snow, forrest ground, basically any terrain you can think of. I want one.