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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.

Predicting the future is near impossible -- but that doesn‘t stop us all from having a red hot go. Human beings have been predicting the future since the beginning of history and the results range from the hilarious to the downright uncanny.

One thing all future predictions have in common: they‘re rooted in our current understanding of how the world works. It‘s difficult to escape that mindset. We have no idea how technology will evolve, so our ideas are connected to the technology of today.