Leo Laporte explains what RAM disks are and why it's probably not worth setting up on your computer. 
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ATG 39: Public Key Crypto Explained - How Does End-to-End Encryption Work?

Every week, The Tech Guy himself, Leo Laporte answers one of your toughest tech questions in language anyone can understand. With over 20 years of experience answering viewers' most technical questions and explaining the fast-moving world of technology, Leo has helped thousands of grateful knowledge seekers. Each week on Ask The Tech Guy, he will drill down on one tricky tech dilemma and get to the root of the problem. If you have tech trauma, don't fear, don't fret, don't freak out - just Ask The Tech Guy!

Although the show is no longer in production, you can enjoy episodes from the TWiT Archives.