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.

How a New Device Can Predict Preference for Drinks

There is an invention that works like a mind reader out there. It's really a device that specifically predicts the kind of drink you will choose as demonstrated in laboratory experiments by Sheena Luu, a doctoral student in biomedical engineering at the University of Toronto. So far, it is 80 percent accurate, which is enough to say that it is like a mind-reading device or gadget.

In the experiment, the subjects were first made to rate drinks on a scale of one to five. Then, they were made to wear a headband. They were then presented with two drinks to choose from on a computer monitor one after the other. Then they were then asked to mentally choose one. Later, the device was used again, but this time, it's to predict which drink will be chosen. It's able to do so with 80 percent accuracy.

The secret behind the cool device? Well, the headband was used to measure near infrared wave activity of the brains of the subjects as they made their decisions in the second phase of the experiment. According to Luu, when the brain is active, the oxygen in the blood increases, and, depending on the concentration, absorbs more or less light. She adds that in some people, the brains are more active when they don't like something, and in others, they're more active when they do like something.

Use the force! This toy is a real brain-wave device that allows you to raise the ball in the cylinder by the sheer force of your will! Try it by buying it! Lots of endless incredible scientific fun!

Find more great science toys in the Play Science blog!

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