The Walkman’s Invention 40 Years Ago Launched a Cultural Revolution

In 1979, when Sony introduced the Walkman—a 14-ounce cassette player, blue and silver with buttons that made a satisfying chunk when pushed—even the engineers inside Sony weren’t impressed. It wasn’t particularly innovative; cassette players already existed, and so did headphones. Plus, the Walkman could only play back—it couldn’t record. Who was going to want a device like that?

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Messaging App Telegram Moves to Protect Identity of Hong Kong Protesters

WASHINGTON—Telegram, a popular encrypted messaging app, will allow users to cloak their telephone numbers to safeguard Hong Kong protesters against monitoring by authorities, according to a person with direct knowledge of the effort.

The update to Telegram, planned for release over the next few days, will allow protesters to prevent mainland Chinese and Hong Kong authorities from discovering their identities in the app’s large group chats.

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