The most cost-effective way to upgrade a PC is usually to swap out the RAM. If it's been a while since you last purchased computer memory, the various options available can be a little confusing. This video from TED-Ed breaks down all the random access memory essentials that you need to know about.
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Selling a computer, smartphone or tablet should be as easy as wiping all your personal data off of it and handing it over to the buyer, but sometimes there are little hidden authentication tricks you might forget about. From iTunes to the Kindle app, here's everything you need to deauthenticate before you sell your device.