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STEPHEN HAWKING: How to build a time machine

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. But what if our scientist uses the wormhole to shoot his earlier self? He's now dead. 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 Nothing is flat or solid. Unfortunately, these real-life time tunnels are just a billion-trillion-trillionths of a centimetre across. The fastest manned vehicle in history was Apollo 10. Paradoxes are fun to think about.

Related:  Llegircosmos

Mad Scientist Worm-hole Generator This is always the hardest part because a worm-hole generator a work of art (not to mention maniacal genius); therefore, you should choose your parts carefully. You need something to house your generator. I used some sort of strainer, but ultimately, it's up to you. Then you need some parts, use whatever you want, just make sure you can explain how it works. If you can't then you probably won't be able to teleport anywhere. Look at the picture to see what I used.

Scientists Discover The Oldest, Largest Body Of Water In Existence Scientists have found the biggest and oldest reservoir of water ever--so large and so old, it’s almost impossible to describe. The water is out in space, a place we used to think of as desolate and desert dry, but it's turning out to be pretty lush. Researchers found a lake of water so large that it could provide each person on Earth an entire planet’s worth of water--20,000 times over.

Gamers make faster decisions than nongamers, just as accurate There's a significant controversy over the value of games that are designed to improve people's mental faculties, as some studies have indicated that brain training only helps prepare you for similar tasks, while others indicate that general improvements are possible. But there turns out to be a type of game that is known to boost a variety of skills, from decision making to tracking multiple objects: standard action games. A study, released today by Current Biology attempts to explain how these video games can produce such wide-ranging improvements. The authors of the study argue that the root of all these tasks involves making a probabilistic inference, where complete information is missing, so people have to make a best guess based on known odds. Video gaming, in their view, increases the efficiency at which people can process the odds and make an accurate decision—gamers simply can do more with less.

Wormhole A wormhole, officially known as an Einstein–Rosen bridge, is a hypothetical topological feature of spacetime that would fundamentally be a "shortcut" through spacetime. A wormhole is much like a tunnel with two ends each in separate points in spacetime. For a simplified notion of a wormhole, visualize space as a two-dimensional (2D) surface. In this case, a wormhole can be pictured as a hole in that surface that leads into a 3D tube (the inside surface of a cylinder). This tube then re-emerges at another location on the 2D surface with a similar hole as the entrance. An actual wormhole would be analogous to this but with the spatial dimensions raised by one.

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. Social Cognition, From Defrag [These are the notes I used to prepare for a talk at Defrag, November 17 2010, formerly titled Social Cognition, From Defrag. Now heavily modified and extended.] It probably is no surprise to you that all known human cultures have language, music, and dance.

Big Bang Discovery Opens Doors to the "Multiverse" Bored with your old dimensions—up and down, right and left, and back and forth? So tiresome. Take heart, folks. The latest news from Big Bang cosmologists offers us some relief from our humdrum four-dimensional universe. The History of the Universe in 200 Words or Less Quantum fluctuation. Inflation. Expansion. Swarm Theory I used to think ants knew what they were doing. The ones marching across my kitchen counter looked so confident, I just figured they had a plan, knew where they were going and what needed to be done. How else could ants organize highways, build elaborate nests, stage epic raids, and do all the other things ants do? Turns out I was wrong.

Moving Mesh Cosmology This website presents online material related to the first cosmological simulations of galaxy formation with the new moving mesh code AREPO. NEWS: 09/13/13: Galaxy mergers on a moving mesh: a comparison with smoothed-particle hydrodynamics 05/13/13: A physical model for cosmological simulations of galaxy formation Moving mesh cosmology: numerical techniques and global statistics Mark Vogelsberger, Debora Sijacki, Dusan Keres, Volker Springel, Lars Hernquist We present the first hydrodynamical simulations of galaxy formation using the new moving mesh code AREPO and compare the results with equivalent GADGET simulations based on the traditional smoothed particle hydrodynamics (SPH) technique. Both codes use an identical Tree-PM gravity solver and include the same sub-resolution physics for the treatment of star formation, but employ a completely different method to solve the inviscid Euler equations.

Meaning of Halflife I'd like to illustrate what this really means. If living creatures had halflives the way radioactive atoms do, the world would be a very different place. What do you mean? Suppose there's an alien species with a halflife of, say, 70 years. You randomly pick out 16 baby aliens and track them to see how long they live. CAN MACHINES THINK? WHEN GARRY KASPAROV FACED OFF AGAINST AN IBM COMPUTER in last month's celebrated chess match, he wasn't just after more fame and money. By his own account, the world chess champion was playing for you, me, the whole human species. He was trying, as he put it shortly before the match, to "help defend our dignity."