Glenn FleishmanSenior Contributor, Macworld

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Glenn Fleishman is the author of dozens of books, including his newly released A Practical Guide to Networking, Privacy, and Security in iOS 10, a book that has information and step-by-step advice on connecting to and managing networks, and securing your data and your privacy. 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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iCloud Keychain syncs accounts between macOS and iOS, but Firefox?

A reader wisely changed his Yahoo password on his Mac weeks ago, but wondered why it updated on his iOS devices, too.

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How to find a digital movie rental longer than 24 hours

Shop around and you might find a 48-hour or longer rental—and even pay less than for 24 hours.

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Podcast 532: I want my TV app (only better)

Glenn and Susie discuss their hopes and dreams for the new TV app coming this December, plus more thoughts on the new MacBook Pros.

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First look: Little Flocker and BlockBlock help monitor your Mac's security

Little Flocker provides fine-grained control over apps accessing files on your Mac, while BlockBlock warns of persistently installed software.

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Yes, if you delete your photos from iCloud Photo Library, they’re deleted everywhere

Our most commonly asked question has the same answer since it was first posed.

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Missing mail? Press Command-L

A reader finds a new macOS shortcut in the Mail app perplexed experts.

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Podcast 531: The new MacBook Pro is here

Glenn and Roman talk about the MacBook Pro—is it enough to satisfy professional Mac users, former MacBook Air owners, and most importantly, you?

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How to merge iPhoto and Photo libraries on a Mac

A reader has enormous photo libraries, and wants to merge and trim them while archiving parts.

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How to troubleshoot a swollen Photos cache folder

A reader uses a macOS Photos library stored on an external drive, but his startup disk has a bloated cache.

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Why the Internet broke and you couldn't do anything about it

The Dyn DDoS attack is like a war in heaven. Mortals beware.

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Podcast 530: Project Titan may not be an Apple Car

Reports that Apple is refocusing Project Titan on software rather than a car have us wondering. Maybe the key to everything is AI and augmented reality.

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How to get rid of useless facebook.com email addresses in your Contacts

A reader has his email to a friend misdirected to an non-existent Facebook address; why is it appearing?

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Nonda Hub+ mini review: The only dock for a 2015 MacBook and a DisplayPort Apple Cinema Display

If you're dying to keep using an older Apple Cinema Display with a 2015 MacBook, the Hub+ Mini is your only choice.

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Satechi Slim Aluminum Type-C Multi-Port Adapter review: Portable MacBook dock makes no compromises

An attractive small package bundles 4K video, USB 3, and passthrough power at an affordable price.

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The cautionary tale of WhatsApp slipping on strong default user security

The Electronic Frontier Foundation has dinged WhatsApp for making it hard for its users to start with the strongest privacy protections.