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. ×

Comment Re:Useful, but not very accurate... (Score 2) 66

To be pedantic, I am certainly finding the data useful, as I am certainly using it. Whether the data is accurate/correct or not, I agree that I have no way to tell. I'm making the assumption that there is some reasonable level of accuracy to be expected from their testing (B12 doesn't use their Edison machines), and getting an expected smooth curve out of most of the independent trials implies some level of process control and precision, but the outliers suggest that individual measurements are suspect.

Of course, it's unclear how I'd get a "control" for this test. I could go to another blood analysis lab - but everytime I've had blood drawn in the last decade, the vials get drawn at a storefront "lab", then packaged up and processed at a backend lab somewhere else. It's not clear to me how to tell whether all the storefronts use a common backend lab, or which storefronts use which labs. A "control" could turn out to be verification of a lab's results by the same lab.

Comment Useful, but not very accurate... (Score 5, Insightful) 66

I loved being able to go to Walgreens, walk into the Theranos booth, and get a $10 B12 test without a prescription. Let me do all kinds of analysis that the standard physicians approach didn't.

But, with weekly B12 readings over the space of two months, there was 1 of the 8 readings that was obviously wrong. As an engineer, I'm used to noisy data so was still able to find the data useful.

Last month, went to Theranos (to one of their blood testing centers, as Walgreens had shut them down by then) and had another done. Another obviously, completely incorrect reading, confirmed by a doctor-ordered test at another lab.

So, even though I love the control they gave me (I could order any of a hundred tests on my own without having to convince my doctor to order it, or my insurance company to pay for it), I think it's best that they go away. Too much of modern medicine is conditioned on the results of a single, unverified test - the assumption is that the lab doesn't have an error rate. At least in my apocryphal case, Theranos grossly failed.

I'll go back to the fantasy land where the other, more traditional labs (that want to charge me $150 for the same B12 test) always have correct readings...

Comment Re:A real comparison? (Score 4, Informative) 286

The amount you save on gasoline, even over the full life of the car, will not pay for the premium price.

Not for current cars, but that's where the Model 3 is so exciting. $35000 is the median car price for new cars in the US, and that's where the Model 3 is intended to hit. There certainly was a premium for the Model S, but the premium is no longer there for the Model 3. Heck, if Chevy is going to try to sell the compact-sized Bolt for 35000, you could say that the Model 3 will be selling at a discount being as it's a bigger car with more features (like, say, a charging infrastructure).

By my calculation, I'll save about $1000 / year on energy costs over my Honda Civic. I normally keep cars for 10 years or so, so I'll be about $10,000 ahead at the end of my ownership - which is about the premium I'd pay over buying a new Civic. That's assuming that gas stays at it's current low price - let it climb back up to $4 or $5, and I'll be way ahead.

Comment Re:And in other news... (Score 5, Interesting) 180


The "chlorine" smell in pools is from Chloramines - a compound made of chorine and amines (ammonia). You get more of it from urine, but it'll build up anyway from other sources. The Chloramines are also what stings and irritates the eyes, nose, and lungs.

How do you get rid of it? Raise the free chlorine level in the pool to 10 ppm or so (normal range is 1 - 3 ppm). Presto, changeo, the pool stops smelling like chlorine.

Cryptosporidium is a difficult to remove parasite that can exist in pool water. How do you treat pool water that's been contaminated with crypto? Raise the chlorine level to 10 ppm for 24 hours (20 ppm if you use stabilized chlorine).

Me? I just keep my pool between 10-20 ppm chlorine all the time. Crystal clear water, no algae, no eye irritation, no chlorine smell, no nasties in the water, no side effects at all. My kids swim in it eyes wide open for hours at a time, friends come over and say "I'm glad you don't use too much chlorine; I can't even smell it".

Comment Re:The perfect tablet is impossible. (Score 1) 231

The DRAM sticks in a PC have nothing to do with the SRAM in a tablet. The SRAM idle power consumption is almost purely leakage, and will be proportional to the number of gates - thus doubling capacity will double power consumption. Active power is unlikely to be significantly affected by doubling the memory, however.

As far as faster CPUs, even on the same process a CPU is synthesized for a target speed. If you want a slower CPU, the synthesis creates smaller (lower-power) transistors, and uses fewer buffers and/or synchronization stages. If you run a CPU synthesized to run at 2GHz at a 1 GHz clock rate, it'll take significantly more power than the same CPU, in the same process, synthesized to run at 1 GHz with a 1 GHz clock rate. At idle, the CPU synthesized for the higher clock rate will have higher leakage.

So, both of your statements are incorrect.

Comment Re:I don't (Score 2) 507

Good Lord! Elitist much?

Are you next going to tell me that I shouldn't listen to music encoded to MP3 because only the hearing impaired could possibly have an excuse for doing so? Going to tell me what lube I should use when I masturbate because everything else is beneath contempt?

I, of course, am typing this on my 1080p 32" LG Television that I use daily attached to my laptop. And I am neither color blind, nor do I have Retinitis Pigmentosa. This is the fourth TV I've used as a monitor, and the only issue I've noted over time is being able to disable the image enhancements that TV's love to include. The last three TV's I've used I've been able to successfully do so, so it may simply not be an important issue anymore.

Comment List by 20-somethings? (Score 5, Insightful) 397

As much as I admire the quality and intentions of the iPhone, I don't see it as being that important. People were texting, calling, and (gasp!) yes, even browsing the web before an iPhone ever showed up. The locked-in experience of the time was vastly inferior to what the iPhone brought to the game, which is of course the main reason that it did so well. But, without the iPhone, the smartphone market would still have developed, and people still would be carrying tiny but powerful little computers in their pockets.

Slashdot Top Deals

There are two kinds of egotists: 1) Those who admit it 2) The rest of us