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A Tin Can Phone, but with Magnets

The tin can phone is a staple of longitudinal wave demonstrations wherein a human voice vibrates the bottom of a soup can, and compression waves travel along a string to reproduce the speaker in another can at the other end. All the parts in this electrical demonstration are different, but the concept is the same. Speakers are

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Adora-BLE Synth Wails Without Wires

Isn’t this the cutest little synth you ever saw? The matching sparkly half-stack amp really makes it, visually speaking. But the most interesting part? There’s not a wire in sight, ’cause [Blitz City DIY]’s futuristic rig sends the bleep boops over Bluetooth LE. Hardware-wise, both the synth and the amp are fairly simple. Underneath each

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Union of Concerned Scientists study: ride-hailing trips today result in an estimated 69% more climate pollution on average than the trips they displace (Andrew J. Hawkins/The Verge)

Andrew J. Hawkins / The Verge: Union of Concerned Scientists study: ride-hailing trips today result in an estimated 69% more climate pollution on average than the trips they displace  —  Union of Concerned Scientists recommends more electric cars and pooled trips  —  Uber and Lyft have weathered criticism about pollution … Union of Concerned Scientists

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ZoomInfo, which operates a cloud market intelligence platform for sales and marketing teams, files to raise around $500M in an IPO (Joanna Glasner/Crunchbase News)

Joanna Glasner / Crunchbase News: ZoomInfo, which operates a cloud market intelligence platform for sales and marketing teams, files to raise around $500M in an IPO  —  ZoomInfo Technologies is the latest heavily funded SaaS player to publicly file for an IPO.  —  Subscribe to the Crunchbase Daily ZoomInfo, which operates a cloud market intelligence

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Millions of tweets peddled conspiracy theories about coronavirus in other countries, an unpublished U.S. report says

Roughly 2 million tweets peddled conspiracy theories and other falsehoods about coronavirus in other countries over the roughly two-week period when the outbreak began to spread outside China, according to a report from an arm of State Department obtained by The Washington Post. Millions of tweets peddled conspiracy theories about coronavirus in other countries, an

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Sources: Amazon to launch a food delivery service in India in March, charging restaurants commissions of 10-15%, about half of what Swiggy and Zomato charge (Aditi Shrivastava/The Economic Times)

Aditi Shrivastava / The Economic Times: Sources: Amazon to launch a food delivery service in India in March, charging restaurants commissions of 10-15%, about half of what Swiggy and Zomato charge  —  The food delivery platform is open to own employees for now, pilots underway across five high-density pin codes in Bengaluru Sources: Amazon to

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Desktop PCB Mill Review

[Carl] wanted to prototype his circuits quickly using printed circuit boards. He picked up a Bantam Tools Desktop PCB Mill and made a video about the results. His first attempt wasn’t perfect, as you could notice under the microscope. A few adjustments, though, and the result was pretty good. Be warned, this mill is pretty

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Anonymous Twitter account @VCBrags hits a nerve mocking VC's propensity for self-promotion by quote-retweeting boastful tweets (Biz Carson/Protocol)

Biz Carson / Protocol: Anonymous Twitter account @VCBrags hits a nerve mocking VC’s propensity for self-promotion by quote-retweeting boastful tweets  —  Investors either are loving or blocking @VCBrags, which retweets investors’ best brags.  —  A parody Twitter account is getting under the skin … Anonymous Twitter account @VCBrags hits a nerve mocking VC's propensity for

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