frequency

Watch audio frequencies visualized in sand

If you've never heard of the Chladni plate experiment, the principle is very simple. Sound frequencies create patterns. If you can make a metal at certain frequencies, acoustic resonance will cause those plates to vibrate with those patterns.

Normally, you can't actually see this -- unless you sprinkle something granular over the top. Which is exactly what YouTube user Brusspup has done in his latest video. Using a metal plate attached to a speaker, he drove frequencies through it using a tone generator to create intricate configurations of sand. … Read more

The 404 1,248: Where we take a staycation in the dead zone (podcast)

Leaked from today's 404 episode:

- Electrosensitive community moving to a secluded town in Green Bank, Va.

- Facebook fixes comment threads for Pages and public figure.

- A promising 'Home' for the Facebook obsessed.

- Five ways to get more out of Facebook Home.

- Prepare a digital will for your Google accounts.

- Roger Ebert's Twitter lives on.

- Microsoft exec reportedly leaves job following testy Xbox tweets.… Read more

Audacious audio editing to go with Audacity Portable

Audacity is one of our favorite audio tools, so we were interested in seeing Audacity Portable, a fully portable version from PortableApps. Like the installed version, Audacity Portable edits your MP3s, WAVs, and other digital audio files. You can remove long intros, extract clips, and change the pitch, tempo, and other parameters of your song files or any audio recording. But, as the name indicates, Audacity Portable is completely portable, which means it runs as soon as you click the program's executable file without having to be installed. You can carry Audacity Portable with you on a USB drive, … Read more

The 404 1,207: Where we learned it by watching you (podcast)

Leaked from today's 404 episode:

- Heart Attack Grill spokesman dies of heart attack.

- Two Atlanta women left with third-degree burns after Instagram feud fuels hot oil attack.

- Apple reportedly testing curved glass for 'iWatch.'

- CBS stations stop Tweeting about Dorner.

Bathroom break video: Beatboxing and studying the SATsRead more

Tawkon: The Android app that detects radiation spikes

The reality of cell phone radiation Buried deep in the pages of your cell phone manual is an often-ignored section on Specific Absorption Rate (SAR), which is the measure of the amount of radio frequency (RF) energy (radiation) absorbed by the body when using your handset. Every phone is measured and rated, and in the U.S. and Canada, the maximum allowable SAR for any handset is 1.6 watts per kilogram. For our database of current cell phone SAR ratings, be sure to check out our ongoing chart on Cell phone radiation levels.

What we don't know, though, … Read more

Link between cell phones and cancer may be unjustified

Are people endangering with their lives, risking cancer, brain tumors, and infertility by talking on their cell phones? A new review by the U.K.'s Health Protection Agency (HPA) says no.

Scientists conducting the review looked at hundreds of studies and assessed all major research into "low-level radio frequency," which they said comes not only from mobile phones but also TV and radio broadcasting, Wi-Fi, and other technologies, and concluded that everyone in the U.K. is exposed to "universal and continuous" radio frequency, according to the BBC.

Despite this constant exposure, the scientists said … Read more

Implantable device propels itself through bloodstream

As implantable medical devices become smaller and less power hungry, they are taking on a variety of new roles. What began as largely stationary objects, such as pacemakers and cochlear implants, are becoming small enough to actually pass through our bodies (i.e. in the form of pills) to deliver drugs and perform diagnostics.

Now, a new class of medical devices is emerging that adds a twist to the traditional implant: the devices are so small that they can travel through our bloodstream, not to mention are powered wirelessly via electromagnetic radio waves, according to Stanford electrical engineer Ada Poon.

By moving through the bloodstream, these tiny implants will be able to perform minor surgeries such as removing blood clots, Poon told an audience at the International Solid-State Circuits Conference in San Francisco this week.… Read more

Vehicle-to-grid venture eV2g connects to utility NRG

It's been said that utilities see electric vehicles as batteries on wheels. A university project to use electric cars to stabilize the grid has brought utility NRG to put that idea to the test.

NRG Energy said today that it will partner with eV2g, a project developed at the University of Delaware to earn EV drivers money by providing services to grid operators. The technology behind the system is being developed by University of Delaware professor Willett Kempton.

The system treats a network of electric or hybrid electric vehicle batteries as a distributed energy source. Plugged-in vehicles provide a … Read more

How to adjust the frequency of Facebook alert e-mails

There it is, an e-mail from Facebook telling you to expect less e-mail from Facebook. Seems counterproductive, doesn't it? Either way, Facebook has started rolling out a new feature that limits the e-mail frequency of alerts to a summary of popular stories.

We know the pain of excessive e-mail alerts all too well, which makes this a welcome change, so long as the e-mailed summaries are few and far between. But, for some users, the old e-mail alert system is what works best and what they are used to--and what they ultimately prefer. With that in mind, we are going to show you how to turn off the new e-mail frequency feature.

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Use your Android as a Wi-Fi optimizer

Optimize your wireless Internet connection with the WiFi Analyzer app for Android. For those of you who may not be networking wizards, this app provides a relatively easy way to analyze the strength of different wireless channels, so you can figure out which to choose for your router.

Before using WiFi Analyzer, you must first understand what a Wi-Fi channel is. A Wi-Fi channel is a range of radio frequencies that a Wi-Fi network uses to communicate with wireless devices. There are a finite number of accessible channels, so when several Wi-Fi networks occupy a small area, channels will often … Read more