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— Increasing the number of hours of sleep adolescents get each night may reduce the prevalence of adolescent obesity, according to a new study by researchers from the Perelman School of Medicine at the University of Pennsylvania.
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During the years I spent in the company of Alexander Graham Bell, at work on his biography, I often wondered what the inventor of the world’s most important acoustical device—the telephone—might have sounded like.
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I remember coming home and curling up into a ball. I was so emotionally and physically exhausted, I couldn’t even move. My productivity was cut to nothing. The next day at the office, I found myself just staring into my computer, for hours. No movement, just staring.
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Electret microphones are the most commonly used microphones today. Every cellphone and laptop has one embedded into it, and many studio microphones are also electrets. They can have an extremely wide frequency response (from 10Hz to 30kHz ), and typically cost less than a dollar.
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[Valentin] is the MacGyver of model rocketry, building a small rocket out of three items many people have hanging around the house. Cat litter, matchsticks, and a ballpoint pen are the raw materials that he rounded up before setting to work on the build.
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— Breakfast might be the most important meal of the day, but up to 60 percent of American young people consistently skip it.
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So we’ve already seen mint can MP3 players and mint can amplifiers for guitars and tons of other projects, why not an FM bug transmitter? Well for starters, a tin can would be the worst place to put an fm transmitter! Luckily I stumbled upon this plastic mint box and thought…
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[Dino Segovis] is at it again! For this week’s installment of his “Hack A Week” series [Dino] is holding a guitar pickup winding 101. Professional guitar pickups can cost hundreds of dollars, but are all essentially a permanent magnet wrapped in a bunch of wire.
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This transmitter design is commonly credited to Japanese multimedia artist Tetsuo Kogawa. It takes audio input through a 1/4″ phono jack and, constructed as shown, without the optional antenna connections, will broadcast an FM radio signal about 30 feet. This is the standard model of Mr.
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That’s the word from authors of two new studies, presented Sunday at a meeting of the American Diabetes Association in San Diego. “Data from this and other prospective studies suggest that the promotion of diet sodas as healthy alternatives may be ill-advised” Dr.
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This instructable is on how to make a wifi wave guide antenna for FREEEEE! (Assuming you already have a few things.) Remove these ads by Signing Up Step 1Materials Can (I just used a #10 can) Knife USB WIFI dongle USB extension cord (my dongle came with one) That’s it.
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If you’re a network administrator, chances are at some point you may need to set up a number of different networks on your IP range. In order to do this, you will need to know how to create different subnets. There are two main things to remember when trying to calculate subnets.
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Ok, not ALL in your head. But certainly PARTIALLY in your head. I don’t know about you guys, but Sci does a little bit of weightlifting. I’m a distance runner, you see, and part of training yourself to run your best means lifting a few weights now and then.
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[Moser’s] introductory guide to MOSFETs serves as a quick introduction for those unfamiliar with the parts. They fill a similar role as a bipolar junction transistor like the 2N2222, making it possible to switch large loads. But fundamentally they are different.
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Reading David McCullough’s 1776, I found myself wondering: Did Americans in 1776 have British accents? If so, when did American accents diverge from British accents? The answer surprised me.
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You know those people who somehow manage to pull the day of the week out of thin air, past or present, no matter how far off a date is? As it turns out, all it takes is a few simple mental tricks and you can wow the world with your uncanny ability to figure out any date’s day of the week.
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Every other week, new research claims one food is better than another, or that some ingredient yields incredible new health benefits.
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When you try to remember something, chances are you look up and away or even close your eyes. This may seem arbitrary, but as cognitive scientist Art Markman explains in Psychology Today, shutting off your vision is actually very helpful when you’re trying to dig up information in your brain.
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All too often, cakes and other desserts look like they’ve been mauled and pulled apart by hand instead of cut with a knife. For a more beautiful, picture-perfect slice, The Kitchn recommends buttering up your knife before cutting. Actually, you only need to wipe on a bit of butter.
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Windows: Unfortunately there are still some offices and organizations that send scanned documents as image files, instead of searchable PDF documents that you can highlight text in or copy/paste from.
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Last month a BBC news story made the Internet rounds, with a somewhat sensational headline declaring the “first Irish case of death” by spontaneous human combustion (SHC).
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If you’re fond of burning candles in your home, you’ve likely spilled melted wax on the carpet more than once. Thankfully, with a paper towel or a rag and an ordinary iron, you can quickly melt and clean up the wax in a matter of moments.
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Salt has a fantastic number of uses (besides improving dishes). One to keep in mind as some of us look forward to winter is keeping your windows—home or car—frost-free with a saltwater solution. Dip a sponge in saltwater solution, wash the inside of your windows with it, and rub them dry.
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— If you are looking to lean out, add muscle mass, and get ripped, a new research report published in The FASEB Journal suggests that you might want to look to your garden for a little help.
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Many textbooks and aircraft manuals say that a wing produces lift because air travelling over the curved topside of a wing has to travel further than wind flowing around the flat underside and so has to travel faster to keep up, generating lift.
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It’s hard to imagine, but engineers have created a material that’s about 100 times lighter than Styrofoam. UC Irvine says the ”micro-lattice” is 99.99 percent air and can be used in such products as battery electrodes.
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A new artificial material appropriately named SLIPS is one of the most slippery materials ever created. The new material, developed at Harvard, is self-cleaning and never gets dirty for a simple reason: nothing can stick to it.
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In my article detailing the command line utilities available for configuring and troubleshooting network properties on Windows and Linux, I mentioned some Linux tools that, while still included and functional in many Linux distributions, are actually considered deprecated and therefore should be ph
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No one, no matter how snooty, has actual blue blood. So why do veins look blue under the skin? Turns out, the answer lies in physics, not biology.
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The days of climbing atop your roof, wrapping yourself in tin foil and striking a techie yoga pose just to get a better wireless signal may soon be coming to an end.
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The device is capable of spot welding thin metals such as foils and battery tabs by sending a pair of high current pulses between the two electrodes whenever [Radu] presses the trigger button.
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Somewhat predictably, I happen to own quite a few pieces of personal electronics that I need to keep charged. Fortunately, the vast majority of devices have moved towards the standard of being charged via USB.
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Guinness gets a bad rap. I’ve heard many people say that they can’t drink too much because it’s such a heavy beer. Yet I was once told that Guinness has less calories than the most popular non-light beers on the market. This led me to do a little research.
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As a former rock climbing instructor, I have seen many contorted struggles to raise a chin over a bar. The pull-up for many is a sort of “test piece” of fitness—an indicator of athletic prowess—that is a cornerstone of a good workout (or a good showing-off).
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By Chris McGrath/Getty Images. At first glance the annual Man vs. Horse Marathon, set for June 9 in Wales, seems like a joke sport brought to us by the same brilliant minds behind dwarf tossing and gravy wrestling.
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— Reduced-fat food products are gaining in popularity. More and more people are choosing “light” products in an attempt to lose weight, or at least in the hope that they will not gain any pounds.
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If you’re looking for a way to let the kids get hand-ons with science this is a perfect example of how to do it. [Erich] wanted to help out with his 7-year-old’s science project.
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Ever wondered just how much being zapped by electricity hurts? Curious if AC is worse than DC? Want to know just how many volts a human body can take? Although many people might cringe at the shear thought of it, [Mehdi Sadaghdar] is an electrical engineer who decided to turn himself into a human
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Trichobatrachus robustus is the Wolverine of the amphibian world. You’ll know when you’ve crossed the line because he’ll gladly break his own bones to produce weapons to break yours. New Scientist reports on the findings of zoologist David Blackburn and his colleagues: At rest, the claws of T.
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A while back, [Matthias] was working on a dust collector for his shop. Being the master woodsmith he is, he decided to build a dust collection system out of wood. Everything worked out in the end, but in creating wooden impellers and blowers, he discovered his creations made a lot of noise.
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This is a tidy looking banner image. But according to [Ian] it contains 52KB of source code. You can’t just read out all of that data. Well, you can but it will be gibberish. Before hiding the bits in plain sight he encrypted them with two different keys.
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Using a lizard, a snaky robot and computer simulations, researchers have captured the secrets of swimming through sand. Physicists filmed the movements of sandfish lizards and snake-like robots as they burrowed through sand, then boiled their motion down into a numerical theory.
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Here’s a surprisingly simple trick for opening a locked suitcase from Lifehacker: simply plunge a ballpoint pen into the zipper, which separates the teeth and allows you to open the suitcase.
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Researchers in the US have made a graphene loudspeaker that has an excellent frequency response across the entire audio frequency range (20 Hz–20 kHz).
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- Mr. Neil Gaiman understands why some things are important.
(Also! He said this about Alice, one of the best things ever.)