The Secret to the Nokia No-Need-to-Charge Cell Phone

Cell phones are very useful as long as they have enough battery to last. While chargers solve this problem to a certain degree, it's still bothersome, especially when you have to carry one around just in case your battery turns low on you. Cell phone maker Nokia dug deep into history and took something that electricity scientist Nikola Tesla had been experimenting on. It concerns ambient electromagnetic waves and harvesting them from the environment to be turned into electricity.

Nokia has managed to make a prototype cell phone that can generate up to 5 milliwatts of electricity from electromagnetic energy in the air. This is very small, but the developers hope to increase this amount to 50 milliwatts, which should be practical enough o keep your cell phone battery constantly charged. It's a wireless way of electricity generation who's time has come for small electronic gadgets like the cell phone.

There are plenty of electromagnetic frequencies to tap and the sources can range from energy coming from space, from the earth, to those given off by other appliances and electrical conduits. As long as the cell phone is in an environment rife with electromagnetic waves, it will stay "live." Of course, you may have to change the battery when it expires, but the new technology takes away the hassle of charging your cell phone regularly.

Perfect Invisibility Cloak Almost a Reality but Still Out of Sight

The movies are fascinated by invisibility, and now it seems scientists are also. There's news that researchers at Duke University are on the verge of making a cloak that is able to bend electromagnetic radiation like light and others of different wavelengths. They say new materials invented are making this possible. But what exactly are these new materials and how exactly do they bend light enough to create the illusion that there's "nothing there?"

The researchers, led by David R. Smith, say that they have developed mathematical commands that would now allow the manufacture of metamaterials that can be placed in a certain algorithmic pattern that will allow deflection of electromagnetic waves. Smith says the invention can now cloak an almost limitless number of waves.

The invisibility cloak is comprised of 10,000 individual pieces of fiberglass arranged in rows. Of course, the details of the formulas used are kept secret but we may soon see the final invention working as expected in the near future - or maybe not. You can see how effective it works in one of the videos that follow.





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