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Comment: Re:Reminds me of one engineer's maxim (Score 1) 501

by yo303 (#47322555) Attached to: A Physicist Says He Can Tornado-Proof the Midwest With 1,000-Foot Walls

In theory, the difference between practice and theory is due to practical considerations that theorists find it impractical to fit into their theories.

In practice, theory uses the practice of theorizing about practical matters, while not noticing that the theoretical method practically distorts the theory beyond application to practice.

Theoretically then, the practical facts are that theory is in practice good for predicting what happens in theory, but impractical as a theory with direct implications for practice, except where theory states that the practice is sufficiently close to the theory to make any difference, for all practical purposes, theoretically zero.

In practice this does not happen very often.

Comment: pizza and pi (Score 1) 218

by yo303 (#46488075) Attached to: Happy Pi Day

If you eat pie today, you will increase your circumference by 2*pi*dr.

And if the volume of a pizza of radius z and thickness a is pi*z*z*a, and its density is p, and the Earth's mass times the gravitational constant is u and its distance from the center is l, the force pulling on that pizza is pi*z*z*a*p*u / l*l.

Comment: Re:Renewable Doesn't Mean Invincible (Score 1) 78

by yo303 (#45498307) Attached to: Another Casualty of Typhoon Haiyan: Geothermal Power

I'd rather be asking why they are bothering to have cooling towers,

That part was explained in TFS. It is because after the expanding pressurized hot water expands into steam past turbines, they cool it and run the condensing steam past turbines a second time to get even more energy out of it. Clever.

Comment: Re:Might be? (Score 1) 314

by yo303 (#44794931) Attached to: Research Shows E-Cigs Might Be As Good For Quitting As Nicotine Patches

Enjoy not being addicted while it lasts. Continue, and you will become hooked, just as if you were smoking a few times a week. Nicotine is on a short list of common addictive drugs that include caffeine, alcohol,,heroin, cocaine, meth etc.

But as discussed elsewhere in this thread, it remains to be seen how harmful nicotine addiction is by itself.

Comment: Re:speed power expandability (Score 3, Interesting) 56

by yo303 (#42460289) Attached to: Raspberry Pi Gets an Open Source Educational Manual

Yes. [ObGeekCred: I wrote Wayne's World for the Gameboy in Z80 assembly and put my picture in as an Easter egg.]

This would be an amazingly revealing tool. If debugging and tracing tools had been a standard thing the whole time for everybody, we would have so many more programmers now, because they let you look inside. It's like when they invented grandfather clocks with windows showing the mechanism: it made for more grandfather clock makers, because more people saw how cool it was to be able to make grandfather clocks.

Further, this needs to be a standard free app on smartphones. More kids are likely to develop for and on their smartphones than for Pi or Arduino. This is much more true in the 3rd world, where many have limited access to PCs while they easily find cheap Android phones.

Once you run it and agree, it turns into a debugging service that traces everything. It runs in a side window and has a slider that runs contiguously between assembly language, through system calls, through full speed. It can slow down any app -- their app -- with stepping, tracing, and breakpoints. It is a virtualizer running on the phone itself.

This tool can easily be developed by a team of ad hoc developers. Imagine that anybody in the world can take apart an app and make a list of when it makes a graphic call, or have it freeze when it makes a file system request, or build timing graphs of various interesting things. This is what builds programmers.

The project needs only a few managers, programmers, marketers, bloggers, braggers, and other passionate people. Building a team of varied people is what will make this work.

Will you help make this happen? Picture that everybody can suddenly take apart all their apps, and see how they work inside. This could really be how things are a year from now. Mail me at j at jth period co

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