On a modern computer, there may be hundreds or even thousands of potential host programs. Scanning every one of these programs every time the virus scanner is run would take an unreasonably long time.

The Drive's DIYers show you what an OBD2 scanner is, how it works, how to use one, and which is the best you can have in your home garage.

If you've used an Android phone recently, you've probably come across the in-screen fingerprint scanner. But how does it work? This, friends, is how.