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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.

Mars

Impact Crater Origin of Mars Meteorites Discovered 11

Posted by Unknown Lamer
from the reptilians-did-it dept.
astroengine writes "Out of the thousands of craters scarring the face of Mars, one has emerged as the likely source of most of the Martian meteorites that have been recovered on Earth, a new study shows. Researchers pinpoint Mojave Crater, a 34 mile (55 kilometer) wide basin on the planet's equator, as the origin of the so-called 'shergottites' meteorites, a family that includes about 75 percent of the roughly 150 known Martian meteorites. The crater is located slightly north and east of Meridian Planum, where NASA's Mars rover Opportunity landed in January 2004."
United States

Secret New UAS Shows Stealth, Efficiency Advances 87

Posted by samzenpus
from the eye-in-the-sky dept.
Fnord666 writes in with this link about one the development of a new unmanned toy for the U.S. Air Force. "A large, classified unmanned aircraft developed by Northrop Grumman is now flying—and it demonstrates a major advance in combining stealth and aerodynamic efficiency. Defense and intelligence officials say the secret unmanned aerial system (UAS), designed for intelligence, surveillance and reconnaissance (ISR) missions, is scheduled to enter production for the U.S. Air Force and could be operational by 2015. Funded through the Air Force's classified budget, the program to build this new UAS, dubbed the RQ-180, was awarded to Northrop Grumman after a competition that included Boeing and Lockheed Martin. The aircraft will conduct the penetrating ISR mission that has been left unaddressed, and under wide debate, since retirement of the Lockheed SR-71 in 1998."

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.

Math

Microsoft's Math-Challenged STEM Education Contest 96

Posted by timothy
from the rounding-sideways dept.
theodp writes "As noted earlier, Microsoft is tackling the CS education crisis with a popularity contest that will award $100K in donations to five technology education nonprofits that help make kids technically literate. Hopefully, the nonprofits will teach kids that the contest's voting Leader Board is a particularly good example of what-not-to-do technically. In addition to cherry-picking the less-pathetic vote totals to make its Leader Board, Microsoft also uses some dubious rounding code that transforms the original voting data into misleading percentages. Indeed, developer tools reveal that the top five leaders in the Microsoft STEM education contest miraculously account for 130% of the vote. Let's hope the quality control is better for those Microsoft Surface voting machines!"

10 to the 6th power Bicycles = 2 megacycles

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