Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!


Forgot your password?
Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. Also, Slashdot's Facebook page has a chat bot now. Message it for stories and more. ×

Comment Re:Not Science, Medicine (Score 1) 317

Uh, no. This is where a good scientist keeps digging into it in order to expand our level of knowledge.

In which case your original premise that "causation is frequently so complex that it can not be deciphered with our current level of knowledge" is not correct. You cannot have it both ways: either the causation is understandable - with hard work and insight - or it is not. If it is understandable then this is what a scientist will go after because understanding is their goal. For a medical researcher establishing causation is enough which is very susceptible to random statistical flukes.

Comment Re:Not Science, Medicine (Score 1) 317

No, they focus on correlation because causation is frequently so complex that it can not be deciphered with our current level of knowledge.

Exactly but if they were a scientist then this is when they would stop and go and look at a different problem that they can decipher with our current level of knowledge. That is part of being a good scientist: you have to tackle things which you can ultimately understand because it is that understanding which is the goal of science. In medicine the correlation is enough: if substance X or activity Y cures ailment Z that's good medicine, why and how is of secondary importance.

Comment Not Science, Medicine (Score 5, Interesting) 317

This is medical research, not science. Medicine uses science because often the best way to cure something is to understand it but, very importantly, it has a very different motivation to science. Finding a "magic" pill which cures disease X without side effects but whose mechanism is completely unknown is great medicine but appalling science. Science is all about understanding how things work, medicine is all about treating human ailments.

This leads to a different approach using the tools of science. Medical researchers tend to focus far more on correlation over causation because that is what is most important to this. Unfortunately this approach leaves them open to random statistical effects which require a very good understanding of statistics to avoid and even then it can still be very easy to fool yourself e.g. the Monty Hall effect.

So lets call this problem what it is: a problem with medical research.

Comment Technology Disruptive like Wars/Catastrophes (Score 2, Informative) 477

Yes, technology levels the playing field.

That is because, like major wars and catastrophes, it can devalue established wealth and power and empowers others to succeed based on their ability. The great thing about technology though is that it usually does this with far fewer people dying and it does not require wars to spur it on even though they often do.

Comment Re:Ways around this (Score 1) 511

American border patrol was just given authority to conduct is security theatre in Canadian airports too

There is one subtle difference doing it in Canada though and that is while Canadian law requires you to tell the truth you have the option to withdraw from the process at any time and not enter the US. Hence if you are asked for your phone you can choose to decline but then you will not be allowed to travel to the US. This is actually quite a sensible arrangement: countries should be free to set their entrance requirements and foreign travelers should be free to decline to travel there if they do not like them. The problem is that if you come from Europe you are already in the US and declining leads to arrest and detention not just denied entry and a return flight home.

Comment Re:The published article (Score 1) 218

It seems that they're claiming energy densities of ~20Wh/L

Compare that to petrol which has an energy density of 46.4MJ/kg which is 12.9kWh per "equivalent litre" (1l water has a mass of ~1kg but petrol itself is less dense than water). Now you gain something back because an internal combustion engine is far less efficient than an electric motor but even if you assume it is ten times less efficient (which is not the case) you would need a fuel tank ~64 times larger to have the same range as an internal combustion engine.

Even for a laptop you would need a 4 litre tank to replace the existing Li-ion which is typically ~80Whr. Before this technology becomes useful they need to gain at least an order of magnitude in energy density. That's when it will become interesting.

Comment Re:And the freezing temperature is...? (Score 1) 218

Actually you would probably want it to work down to -50C since -30C is not the extreme low just the typical low for a week or two most winters. Going below -40C is not uncommon for a day or two every few years so -50C should be relatively safe unless you live up in the territories.

Comment Re:Not Ready for Prime Time (Score 1) 123

They can build something that can fly itself and take you from point A to point B.

Yes they can but can they do this at a cost which most people can afford and with a vehicle that is small enough that it does not take up much more space than a car and can take off and land vertically while not making more noise than a car? It also needs to be capable of travelling a few hundred kilometres too.

By the time you add all those caveats it becomes a lot harder to build such a device. This is what is preventing the era of flying cars, not the lack of infrastructure. That will come once a practical flying car is available which I doubt will be in three years.

Comment Pragmatism (Score 1) 328

What's their angle - drive wages down?

I expect that their angle is pragmatism. Given the way things seem to be going in the US foreigners are increasingly unlikely to travel there so you won't encounter people speaking foreign languages and the same restrictions will mean there will be a huge shortage of IT skills such as programming.

Comment Re:This is a *domestic* fraud probe. (Score 1) 91

That appears to mean that the person who used gmail lives in the US, and Google just randomly decided to store part of it in Ireland.

Then the US needs to have laws which do not allow companies to do this because once the data has left the US and entered the EU it is subject to EU law. You would not want data in the US related to chinese citizens to be subject to the chinese government accessing it would you? The same principle applies here.

Slashdot Top Deals

Receiving a million dollars tax free will make you feel better than being flat broke and having a stomach ache. -- Dolph Sharp, "I'm O.K., You're Not So Hot"