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Comment Another way of thinking of it (Score 1) 1

I have been jokingly suggesting this idea to colleagues for a few months. The way I think of it is that if
you want to convert electric power into heat, you may as well extract the free computation that this makes available.

Of course the technology needs to be very stable, You don't want to have to replace your heating plant every couple of years.

Hardware

Submission + - Heat your home with a server or two (i-programmer.info) 1

mikejuk writes: A new paper from Microsoft Research suggests a radical but slightly mad scheme for dealing with some of the more basic problems of the data centre.
Rather than build server farms that produce a lot of waster heat, why not have distributed Data Furnaces, that heat home and offices at the same time as providing cloud computing? This is a serious suggestion and they provide facts and figures to make it all seem viable. So when it gets cold all you have to do is turn up the number crunching...

Space

Submission + - Dr. Michio Kaku on reality of a Space Elevator (youtube.com)

An anonymous reader writes: Now that the shuttle has been retired, the hunt is on for revolutionary technologies to economically lift cargo and humans into space. And a space elevator just may be the answer. According to renowned physicist Michio Kaku, recent developments in nanotechnology may make this technological marvel a reality by the end of this century.
Android

Submission + - Android passwords are stored on disk in plain text (google.com) 1

derGoldstein writes: A new issue page was added to the Android project site: "Issue 10809: Password is stored on disk in plain text". The issue details: "The password for email accounts is stored into the SQLite DB which in turn stores it on the phone's file system in plain text". Andy Stadler replied in a comment: "rest assured, I am not closing this bug. We recognize that this is causing concern for some users, and we're going to look at identifying steps that can make your data more secure."

Comment Re:Freedom Of Speech, eh? (Score 2) 127

Twitter is not, in any reasonable sense, a place to have private conversations. A more interesting question perhaps is whether this is slander (defamation in a public but transitory form, as by telling a lot of people verbally) and defamation in a permanent form (as by printing a book). In fact, in this day and age is slander even possible?

Comment Re:Noteworthiness (Score 1) 210

One more point, I left out.

The SI units have been defined in non-Earth centric ways for many many years now. A minute is 60 seconds where a second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. Which is the same throughout the entire the universe and to the best of our knowledge the same for all time.

This measurement suffers from the same problem. Define a second at a point in time when a caesium-133 atom had never existed. We base our units of time on things that exist today and still don't even really have a solid grasp of what we are even measuring. At least, I have never heard of anyone claim to have a complete understanding of time, what it is, whether it exists naturally or is purely a construct of (human) consciousness and exactly how we all travel through it. .

I don't know about complete, but Stephen Hawkings "A Brief History of Time" (and the real physics textbooks underlying the popularisation) show a pretty good degree of understanding.

As for measuring time. We rely on our (extensive) observation that lots of other processes in the universe correlate very well with the oscillation of the radiation ...caesium-133 atom. So if the half life of a neutron is roughly 9 trillion cycles of that radiation one day, it seems to be the same the next day and in the next lab and (via slightly more indirect measurements) on distant stars and so on. That fact that all these experiments correlate is what leads us to believe that time is a measurable well-behaved quantity that might be intersting. So we can use (for example) neutron decay as a "secondary time standard".

Comment Re:Did some wiki-browsing... (Score 1) 189

You start by finding a complex hamiltonian with a ground state describing the solution to your problem

I'm not a math whiz, but to me, this says: "You already know the answer to the problem"...

No. You can think of this as posing the question in a very specific way -- a little constructing a wire frame so that soap films on it
naturally form the shape of the best surface for some purpose.

The open question is what questions can in fact be posed this way?

Comment Re:Did some wiki-browsing... (Score 3, Insightful) 189

A traditional digital computer is pretty hellish to program too if you take away all the props -- you have to find a set of bit values for the memory such this immense consrtructrion of hundreds of millions of gates, clocks, latches, etc. will evolve to give your answer in a reasonably ti,me.

Comment Re:So, how long has the NSA had one? (Score 4, Informative) 189

An Adiabatic Quantum Computer is quite a different beast from a quantum computer in the usual sense, and even if it can solve the same class of problems in polynomial time (not at all obvious at this stage) it isn't at all clear that 1 qubit in this machine does the same work as 1 traditional qubit.

They are, to be honest, being a little bit naughty calling this a quantum computer at all, although it does compute and has quanta, but so does my phone.

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