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The SIM cards that fit into those tiny slots in your cell phone and tell your cellular network to whom your calls are to be charged come in four different sizes. With the only real difference between them the amount of excess plastic on which the circuitry is housed, MicroSIMcutter's new SIM card cutter can cut either mini- or micro-SIM cards into the nano-SIM form factor, allowing a user switching phones to recycle their existing card. All SIM cards have basically the same circuitry – a microcontroller and small amounts of permanent, rewritable, and random access memory. They come in four sizes, ranging from the credit card sized original SIM card to the nano-SIM card, which measures 12.3 mm x 8.8 mm (0.48 in x 0.35 in). Despite the different sizes, they have the same size and pattern of electrodes, and the electronics are buried under the electrodes. The only difference is how much excess plastic is attached to the active part of the card. The SIM cards are designed to b

3D printing pioneer  MakerBot  is on a mission to make it easier and more affordable to create all sorts of objects, one extruded layer at a time. But being able to print in three dimensions isn't worth too much right now if you don't have some pretty serious CAD skills or access to the printable data you need to render the object you want. MakerBot founder Bre Pettis kicked off the first day of the South By Southwest Interactive festival (SXSW) running from March 8-17 in Austin, Texas, by introducing one possible solution to this chicken or the egg dilemma – a desktop 3D scanner dubbed the MakerBot Digitizer. “It’s a natural progression for us to create a product that makes 3D printing even easier. With the MakerBot Digitizer Desktop 3D Scanner, now everyone will be able to scan a physical item, digitize it, and print it in 3D – with little or no design experience," said Pettis. At this point the Digitizer is just a prototype that uses lasers and cameras to scan

  Bringing the concept of an "artificial leaf" closer to reality, a team of researchers at MIT has published a detailed analysis of all the factors that could limit the efficiency of such a system. The new analysis lays out a roadmap for a research program to improve the efficiency of these systems, and could quickly lead to the production of a practical, inexpensive and commercially viable prototype. Such a system would use sunlight to produce a storable fuel, such as hydrogen, instead of electricity for immediate use. This fuel could then be used on demand to generate electricity through a fuel cell or other device. This process would liberate solar energy for use when the sun isn't shining, and open up a host of potential new applications. The new work is described in a paper this week in the  Proceedings of the National Academy of Sciences  by associate professor of mechanical engineering Tonio Buonassisi, former MIT professor Daniel Nocera (now at Harvard Un