STEPHEN HAWKING: How to build a time machine By STEPHEN HAWKING Created: 18:47 GMT, 27 April 2010 All you need is a wormhole, the Large Hadron Collider or a rocket that goes really, really fast 'Through the wormhole, the scientist can see himself as he was one minute ago. Hello. Time travel was once considered scientific heresy. To see how this might be possible, we need to look at time as physicists do - at the fourth dimension. But there is another kind of length, a length in time. To see what that means, let's imagine we're doing a bit of normal, everyday car travel. Let's indulge in a little science fiction for a moment. Physicists have been thinking about tunnels in time too, but we come at it from a different angle. Enlarge A wormhole is a theoretical 'tunnel' or shortcut, predicted by Einstein's theory of relativity, that links two places in space-time - visualised above as the contours of a 3-D map, where negative energy pulls space and time into the mouth of a tunnel, emerging in another universe. Nothing is flat or solid.
Physics Flash Animations We have been increasingly using Flash animations for illustrating Physics content. This page provides access to those animations which may be of general interest. The animations will appear in a separate window. The animations are sorted by category, and the file size of each animation is included in the listing. Also included is the minimum version of the Flash player that is required; the player is available free from In addition, I have prepared a small tutorial in using Flash to do Physics animations. LInks to versions of these animations in other languages, other links, and license information appear towards the bottom of this page. The Animations There are 99 animations listed below. Other Languages and Links These animations have been translated into Catalan, Spanish and Basque: En aquest enllaç podeu trobar la versió al català de les animacions Flash de Física. These animations were written by David M.
Brain Explorer - StumbleUpon Fuel cell Demonstration model of a direct-methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image Scheme of a proton-conducting fuel cell The first fuel cells were invented in 1838. There are many types of fuel cells, but they all consist of an anode, a cathode and an electrolyte that allows charges to move between the two sides of the fuel cell. The fuel cell market is growing, and Pike Research has estimated that the stationary fuel cell market will reach 50 GW by 2020.[3] History[edit] Sketch of William Grove's 1839 fuel cell The first references to hydrogen fuel cells appeared in 1838. In 1939, British engineer Francis Thomas Bacon successfully developed a 5 kW stationary fuel cell. Types of fuel cells; design[edit] Fuel cells come in many varieties; however, they all work in the same general manner. At the anode a catalyst oxidizes the fuel, usually hydrogen, turning the fuel into a positively charged ion and a negatively charged electron. SOFC[edit]
Here are 10,000 reasons to be excited about deep-space exploration They'll ask why we continue to strive to see further and deeper into space than ever before, without knowing what we'll find. They'll ask why we insist upon exploring a solar system that, by their account, has no immediate bearing on our lives. And they'll ask why, in light of recent budgetary crises, space agencies the world over deserve funding to seek out answers to the mysteries of a Universe that we will never fully understand. Strawmen are made of straw. The first two questions are asked by ignoramuses. To use an analogy, I love travel. But even if we all can agree on the value of travel, is it still not grossly irresponsible to pay for your vacation to Europe or your study-abroad in India when you can't pay your rent, utilities or student loans without a credit card? I loved Hubble, and I'm sure I'll equally love the Webb telescope. But let's not kid ourselves by pretending that we are not in a place today that forces us to make budgetary priorities.
All Experiments | Practical Physics This website is for teachers of physics in schools and colleges. It is a collection of experiments that demonstrate a wide range of physical concepts and processes. Some of the experiments can be used as starting-points for investigations or for enhancement activities. Physics is a practical science. Good quality, appropriate physics experiments and investigations are the key to enhanced learning, and clarification and consolidation of theory. We have published a new set of resources to support the teaching of practical science for Key Stages 3-5.
All Documentaries Welcome to the Must Watch section. It is our understanding that for a truly democratic society to exist, there must be a free flow of easily accessible information. For the most part (not including heavy censorship in China), the Internet has allowed for this free flow of information to everyone and anyone with access to the internet and it is imperative that this right continues to be protected. The documentaries below epitomize the importance of free flowing information and the lack of it in mainstream media. Please take the time to educate yourself and to educate others about the important issues raised in each of the documentaries. Free-Energy Devices, zero-point energy, and water as HHO fuel