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London - Scientists have created the world’s thinnest light bulb using the wonder material graphene in a layer just one atom thick. Graphene, a form of carbon, has been hailed as having a vast range of uses. The super-thin material’s ability to shine light is seen as a key step towards slimmer computer and TV screens. The light bulb was made by attaching a small strip of “atomically thin” graphene, acting as a filament, to metal electrodes. When a current was passed through it, the graphene lit up. The filament, despite being tiny, is visible to the naked eye when it is on. The graphene reaches very high temperatures – 2 500C – but does not melt the electrodes because the “hot spot” is restricted to the centre of the filament. James Hone, professor of mechanical engineering at Columbia University in New York, said: “We’ve created what is essentially the world’s thinnest light bulb.” He said the light “will pave the way towards the realisation of atomically t

WASHINGTON:    Human activity is leading to the rapid draining of about one third of the planet's largest underground water reserves and it is unclear how much fluid remains in them, two new studies have found. Consequently, huge sections of the population are using up groundwater without knowing when it will run out, researchers said in findings that will appear in the journal Water Resources Research and were posted online on Tuesday. "Available physical and chemical measurements are simply insufficient," University of California Irvine professor and principal investigator Jay Famiglietti said in a statement. "Given how quickly we are consuming the world's groundwater reserves, we need a coordinated global effort to determine how much is left," added Famiglietti, who is also the senior water scientist at NASA's Jet Propulsion Laboratory. Scientists used data from special NASA satellites to measure groundwater losses. In the first

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You may have enjoyed creating swans, frogs, or inflatable boxes with origami in the past. Sean Choi, however, is using it to create electricity. Choi is an   engineer at Binghamton University   who’s been working on creating a   battery   to power biosensors. His focus has been on using paper, because it’s biodegradable, easy to source, and cheap. Just like a regular alkaline battery that you’d buy on your way out of the grocery store, Choi’s paper battery utilizes carbon. In the origami battery, however, the carbon acts as the anode rather than the cathode. It gets screen-printed on to form a water-absorbing layer on one side of the paper. On the other side, a coating of a nickel-based solution is applied to create an air-breathing anode. The battery needs one more thing to be able to produce power: bacteria. Choi says it can come from “any type of organic matter.” One very easy place to find bacteria is in untreated water. A murky puddle of water sitting in a ditch or

Wi-Fi signals may one day save a person’s life, claim researchers who have proved that these can be used to count people in a given area. Apart from this, the technology may find its way into smart homes or buildings for the purpose of energy efficiency. Imagine a lighting system which can autonomously control how energy is consumed based on how many individuals are in a room and where they’re seated. The wireless signals do not need to connect to Wi-Fi enabled devices being carried by the people in a given space, in order to make a headcount. It would be impractical because not everyone owns such gadgets. Professor Yasamin Mostofi at the University of California, Santa Barbara and her team have built a system which uses the measurements of a Wi-Fi link to count the number of folks within a certain area. Mostofi’s experiment involved placing a couple of Wi-Fi cards across from each other within a 70-square meter region. Then volunteers were asked to walk around with

Standford University scientist Manu Prakash and his team of students have developed a computer that can operate using the fundamental physics principle of moving water droplets generate energy, which may heral new class of computers altogether based on manipulating water droplets for energy. Ever since he was a graduate student, Prakash tossed with the idea of ussing little droplets as bits of information and utilize the precise movement of those drops to process both information and physical materials simultaneously. He first created a rotating magnetic field that could act as clock to synchronize all the droplets. When the idea looked more promising, Prakash and his graduate student Georgios “Yorgos” Katsikis, worked on manipulating droplet fluid dynamics with an operating clock, demonstrating “a synchronous, universal droplet logic and control.” The droplet computer can theoretically perform any task like the conventional electronic computer but currently a