Glenn FleishmanSenior Contributor, Macworld

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Glenn Fleishman is the author of dozens of books, including mostly recently Take Control of Slack Basics, a book on mastering and becoming efficient in Slack. He's a senior contributor to Macworld, where he writes the Private I and Mac 911 columns and hosts the Macworld podcast, and contributes regularly to many periodicals.

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Replacing Fire OS's encryption isn't enough: Amazon should turn it on by default

Amazon says few users turned on full-device encryption, but that's the wrong approach to helping users protect their data. Thankfully, the company changed its mind.

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Can you merge synced data from multiple Apple IDs?

Many people want to consolidate their information to a single Apple ID, but some things would get left behind.

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Podcast 497: Calmly discussing FBI vs. Apple

Glenn and Susie update you on Judge Orenstein's ruling and other happenings, and confess our high expectations for the next iPhone and iPad announcement.

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How to solve a com.apple.AOSAccounts error 4 message

It seems related to iCloud Photo Library, but the cause is apparently an outdated credit card and the iTunes Store.

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Tune up (or tear down) your social networks' app permissions

Pop quiz: Do you know to how many apps and websites you've given permission to use your Twitter, Facebook, Google+, and others? Time to check.

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Airfoil 5 review: Audio utility pumps up the volume with Bluetooth support, Airfoil Satellite, and more

This synchronized multi-speaker app adds speaker groups, remote control, a sleeker interface, and Bluetooth support.

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Yesterday, all my files seemed so far away

Oh, I believe in Smart Folders for yesterday.

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What happens when your Time Machine drive icon changes

A reader wonders why the color changes between yellow and green on his Time Machine backup volume.

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Podcast 496: Apple vs. the FBI

Glenn and Susie are joined by Rich Mogull, and everyone is angry. Enjoy!

How to boost your Wi-Fi signal without any tricks

The higher-frequency flavor of Wi-Fi used by 802.11n and 802.11ac can have higher power output and further range by picking the right channel.

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Monoprice Select Series Portable Cell Phone Charger review: USB-C battery pack falls short

Monoprice's USB-C battery pack can charge a MacBook to 70 percent capacity in two hours.

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Talentcell 10400mAh 38Wh Portable Charger review: USB-C battery pack is a good value

It takes a while to charge a MacBook to 80 percent capacity, but it's a good battery pack for the price.

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Anker PowerCore+ 20100 review: A top-performing USB-C battery pack

If you need a high-capacity battery that can fully charge a 12-inch MacBook, this is your best bet.

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RAVPower 20100mAh External Battery Pack review: Charger sports a versatile set of ports

Back pack supports Qualcomm's Quick Charge 2.0 standard.

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Best USB-C battery pack: We review portable batteries for the latest MacBook and iOS devices

More power for your 12-inch MacBook and iPhone.