How do quartz watches keep time? Steve Mould gives a great demonstration explaining how they work. Quartz is piezoelectric, which means when it is deformed it generates an electrical signal. A quartz watch has a tiny quartz tuning fork that's been calibrated to vibrate at 215 cycles per second. This signal is fed through a series of 14 flip-flop circuits, each of which divides the frequency of the signal by 2. By the time the signal goes through the 14th flip-flop, the frequency is one cycle per second.
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9:18 am Fri
May 24, 2019
How a quartz watch works
How neural networks work - A good explainer video
How does a neural network connect perceptions to concepts? In other words, how can you make something that accepts an array of pixels as an input and correctly outputs “dog” or “cat?” This video from Art of the Problem does a good job of explaining how neural networks are able to do this, and why […]
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What does a fan do in a vacuum chamber?
In this video of The Action Lab, the Action Man puts a small fan into a vacuum chamber and pours a bunch of little styrofoam beads in it. At atmospheric pressure the beads fly all over the place. As he reduces the pressure inside a vacuum chamber, the beads slow down and eventually stop moving. […]
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Big Clive examines a fake UV disinfection lamp sold on eBay
YouTuber Big Clive bought a “UV disinfection lamp” on eBay. He tested it first by turning it on and aiming it at the back of his hand for a few seconds and then sniffing his hand for “skin damage.” There was no odor, which was a good sign that it’s not really producing UV-C radiation, […]
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Develop in-demand digital marketing skills with the help of these training classes
It’s tempting for many young professionals to assume that because they’ve spent most of their lives posting links to Facebook or pushing selfies to Instagram that they have the skills needed to be a digital marketer. Creating compelling content is certainly important, but if you’re not up to speed on search engine optimization (SEO), how […]
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Get over 60 hours of elite coding instruction for just $40
With everybody working from home now, it’s natural to start thinking about careers where not going into the office is more the norm than the exception. Better yet, many are looking to start careers as freelancers, professionals who build their livelihoods around the scope of their talent and not the fortunes of one all-encompassing employer. […]
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Here are 40 of the best charging cables, wireless docks, power banks, and more on sale this weekend
“The way to have power is to take it.” — Boss Tweed. We think an 18th-century political power broker probably had a different definition of power in mind when he made that statement, yet the sentiment still applies. We’ve all got devices all but falling out of our pockets and the need for power to […]
