Scoperta la 'droga' dei tumori, E' anche il loro tallone di Achille, Una proteina che non esiste in condizioni normali scatena il tumore, lo alimenta e lo lega a sé, rendendolo completamente dipendente.
Techzilla.it Google si butta nella fibra e sfida internet provider e canali tv Google si è buttata ufficialmente nella competizione con gli operatori via cavo annunciando che entro la fine dell'anno lancerà i suoi servizi internet ad...
If Disney ever decided to animate Marvel Comics' mutant roster, the final product might just look like these character designs by Matthew Humphreys. Bonus points for mohawk Storm, and I can appreciate how he utilized Psylocke's blindingly purple 1980s armor. Hat tip to Mogo!
Così il cervello riconosce le azioni che hanno una fine, La consapevolezza alla base di sopravvivenza e paura della morte, Osservate le aree del cervello che ci permettono di distinguere gli eventi che hanno una fine da quelli che non prevedono...
Mentre la Mayer viene eletta nuovo amministratore delegato Yahoo! nonostante la gravidanza, la Minetti e la Santanchè perdono tempo a lanciarsi dardi avvelenati. Paese che vai usanze (diverse dalle nostre) che trovi.
Social Media, Social Life: How Teens View Their Digital Lives is the latest research report from Common Sense Media's Program for the Study of Children and Media. We surveyed over 1,000 13- to 17-year-olds nationally to understand how they perceive social media (like Facebook and Twitter) affects their relationships and feelings about themselves.
Scientists have created an ‘early signs timeline’ for Alzheimer’s disease that they believe could help experts detect the condition up to 25 years before it strikes. The study, published in the New England Journal of Medicine, looked at 128 people with a family history of early Alzheimer’s.
The participants were all selected from the Dominantly Inherited Alzheimer's Network, a research centre for those who are genetically predestined to develop the degenerative disease, and considered to have (at least) a 50% chance of inheriting one of three gene mutations that cause the disease.
Robot avatars have got a step closer to being the real world doubles of those who are paralysed or have locked-in-syndrome. Scientists have made a robot move on a human's behalf by monitoring thoughts about movement.
The man-machine link joined a man in a brain scanner in Israel and a robot wandering a laboratory in France. The person controlling the robot could also see through the eyes of his electronic surrogate. The researchers are now working on ways to make the man-machine link more sensitive and to let people speak via the robot.
The research project connected a robot to a man having his brain scanned using fMRI (Functional Magnetic Resonance Imaging). This monitors blood flowing through the brain and can spot when areas associated with certain actions, such as movement, are in use. Using brain scanners is a step beyond current efforts to link up men and machines. Much recent work involved teleoperated robots in which humans manipulate controls, such as joysticks, to make a robot move.
By contrast, the scanning approach is more subtle and attempts to fool the human subject into thinking that they are embodied in the robot. Eventually the small robot will be swapped for one the size of an average human.
The experiment helping to prove the technology works linked up student Tirosh Shapira who was in a lab at Bar-Ilan University, Israel, with a small two-legged robot thousands of kilometres away at Beziers Technology Institute in France.
Siamo felici di parlarvi di una bella iniziativa, che partirà domani, realizzata dalla Fondazione Piemontese per la Ricerca sul Cancro che sbarca sui Social Media e lo fa lanciando il #TweetSolidale, un modo nuovo di partecipare a sostenere la ricerca...
How do we know time travelers aren’t constantly changing the past? We take it for granted that the past is fixed. History always happened the way we remember it happening. But how do we know for sure that that's the case? If time travel is possible, time travelers could be zipping back and changing things around all the time. How would we even be able to tell if that was the case?
We asked a number of experts on time travel — none of whom have actually traveled in time themselves. (Or if they had, they were keeping it under their hats.) Top image: DISENT on Deviant Art.
First of all, it's really difficult to know one way or the other, because "presumably, when a time traveler would change our past, this would also instantaneously change our memories of the past in order to render them consistent with the 'new' past," says Christian Wüthrich, a professor of Philosophy and Science Studies at UCSD. "If the changes to our past occur instantaneously and completely consistently, i.e., involving updates to all memories and record of the past, then we may not just not know it for certain."
But according to the experts, here's how you can tell that someone isn't changing the past all the time.
Time travel is impossible. We heard this a lot, from many of the experts. As Jon Thaler, a physics professor at the University Illinois at Urbana-Champaign, tells io9: "The problem is that we don't know how to construct a theory that permits time travel. Without a theory, it is difficult to know what phenomena to look for." Thaler wrote the time travel section of the Usenet Physics FAQ, in which he explains that the Theory of Relativity might permit "closed timelike curves" that allow time travel — but the famous "grandfather paradox" (in which you go back and kill your own grandfather as a baby) proves the whole thing is impossible. Thaler tells io9: "In a nutshell, it appears that "closed timelike curves" — jargon for the physical setup that permits time travel — are incompatible with quantum mechanics." This is basically how physicists interpret the "grandfather paradox," except that this approach is more quantitative, "and therefore the kind of situation that physicists like to analyze."
Even if time travel was possible, you couldn't change the past anyway. We heard this one a lot, too. Wüthrich says that many philosophers of science assume that the past must be consistent, to avoid those nasty paradoxes. These "consistency constraints" mean that there's only one past, and it's fixed. Therefore, says quantum physics expert Todd Brun with USC, "even if you travel back to the past with the intention of changing history, events will conspire to force you instead to conform to it (and history would already include the presence of time travelers)."
This is why many philosophers of time like stories such as Robert A. Heinlein's "All You Zombies," where it's totally consistent, says Nick Huggett, author of Everywhere and Everywhen: Adventures in Physics and Philosophy. Huggett, a philosophy professor at University of Illinois at Chicago, adds:
It's now not at all clear what it could mean to change the past at all. To say something changes is to say that it was one way at one time, and another way at another time, right? So would you have changed the past? That seems to require that yesterday was first one way, and then another — first you didn't arrive by time travel on that day, and then you did? But in our story you did arrive by time travel, and so the first option never happened, and so the past was not changed by your arrival — again because it didn't make something different happen.
The alternative to this notion is that every time you travel back in time and change stuff, you're creating a new universe, according to Hugh Everett's "many worlds" theory. This new reality would still have a consistent past, which everybody would remember the same way — but it would be the past that resulted from the time traveler's changes.
There could be multiple universes, and altering the past will cause the universe to branch. Weird and science fictional as that sounds, we have to take it seriously in quantum mechanics, where one of the leading interpretations of the theory is the so-called "Many Worlds" picture, in which every quantum event causes the universe to branch. But even in this case, one cannot go back and change the history of one's own universe.
You might only be able to travel back as far as the point where the first time machine was invented. Unless someone's invented a time machine and we just don't know about it yet, this would mean that we're safe. Explains Vanderbilt University Physics Professor Thomas J. Weiler:
Time travel to the past, if at all possible, may only go back as far as the first time machine. Since the past of our civilization lacks a time machine, it is immutable, whereas the past of more advanced civilizations may be mutable.
Nobody's showing off The only clear way to know if time travelers were going back and messing with the past would be if they bragged about it. Which, being people, they probably would. Says Huggett:
Suppose tomorrow you go back in time 2 days (i.e., to yesterday), and sensationally appear on national TV making correct predictions about today. It would be well known today that your future self had affected the past.
Although, even then, we wouldn't know for sure if these boastful time travelers had actually changed anything, since we'd only remember one past.
There would be physical traces Depending on the method of time travel people were using, you'd expect there to be physical traces, says Huggett. In Carl Sagan's novel Contact, time travel is possible using a path in spacetime that leads to the past. According to Huggett, this kind of wormhole "requires exotic forms of matter to hold it open, which may be detectable." Also, there's the question of conservation of energy — when you appear in the past, you won't be formed out of matter and energy that were already there, but instead you'll basically be importing energy from the future. This could create traces that might be detectable — if anybody actually was coming backwards in time to our era. So in a nutshell, the results of time travel would be unnoticeable to those of us who are stuck in linear time, but the methods of time travel would probably leave some trace.
Screwing with cause and effect would change the laws of probability If someone really could go back and change the past, this could mean that effects would precede causes, Brun tells io9. And that, in turn, could mean that everything would go topsy-turvy, leading to logical inconsistencies that we might well notice. Brun explains:
The mixing up of cause and effect can make otherwise improbable events become much more likely. So if we suddenly find the laws of chance violating our common sense estimates of probability, that could mean that time travel is going on nearby. In principle this means that one could detect the existence of time machines — perhaps even before they are ever built! But it's hard to know exactly what to look for.
History proves they're not doing it. Let's give the last word to Harvard University Physics Professor Gary Feldman: "If time travelers are constantly changing the past, they are not very good at it. Why did they not avoid two disastrous and pointless world wars in the past century?"
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