Archive for November 4th, 2009
From:
Keep Asking Blog
How does a spacecraft measure its speed in space?
November 4th, 2009 by Marshall Brain
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You Asked:
How does a spacecraft measure its speed in space? — Andru, Bucharest, Romania
Marshall Brain Answers:
When a car measures its speed, it does it by counting how many times its wheels rotate and sending that information to its speedometer. When an airplane measures its speed, it uses a pitot tube to detect its movement through the air.
But something in space is moving through a vacuum, and there is nothing material against which it can measure its speed. So it has to use other techniques.
One way is to use an inertial guidance system. Accelerometers and gyroscopes measure every turn and acceleration that affects the spacecraft and a computer uses uses this information to calculate the current velocity.
If an object is in orbit around earth, one way to calculate its speed is to measure its altitude, the shape of its orbit and the amount of time it takes to complete one orbit.
If a spacecraft has an atomic clock on board, it can send the current time to earth in a radio transmission. The amount of time it takes for the signal to arrive can be used to calculate distance. Looking at change of distance over time can reveal speed. The GPS satellites use atomic clocks to reveal distance like this.
Other techniques use radio waves. For example, the shift in radio wave frequencies (known as Doppler shift) from the spacecraft when they are received on earth can be used to determine speed. A spacecraft can also use radar reflecting off a moon or planet that is moving at a known speed.
Using techniques like these, scientists discovered what is now known as the Pioneer Anomaly – a very small perturbation in the speed of the Pioneer probes that have left the solar system.
From:
FanStuff Blog
‘2012′ and the Disaster Movie as Fairy Tale
November 4th, 2009 by Tracy V. Wilson
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Roland Emmerich’s latest foray into all things end-of-the-world, “2012,” hits theaters next week. And, like his last big-budget disaster flick, “The Day After Tomorrow,” it promises to be a visually frenetic hodgepodge of as many types of natural disaster as possible. It has volcanoes. And earthquakes. And tsunamis. It doesn’t — at least from the look of the previews — depict the resulting flood flash-freezing and somehow not expanding to crush everything in its path, but that probably would have been anticlimactic in the wake of a tidal wave big enough to capsize an aircraft carrier.
From:
TechStuff Blog
New York Attorney General Sues Intel
November 4th, 2009 by Chris Pollette
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Microprocessor manufacturer Intel has been fielding legal complaints against it in Europe and Asia for a while now, but this morning New York Attorney General Andrew Cuomo filed a lawsuit against the company for anti-competitive practices.
According to Ashlee Vance’s article in The New York Times, the state claims that Intel has been using its position in the microprocessor marketplace to strong-arm Advanced Micro Devices (AMD) out of the way, which violates both state and national law.
From:
BrainStuff Blog
How the Prometheus Device works – lets you shoot FIRE from your hands
November 4th, 2009 by Marshall Brain
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You kind of have to see it to believe it – with the Prometheus Device you can shoot flames out of your hands:
In the video he says:
It uses a microcontroller to actuate a servo-controlled valve which is on top of this tank of a butane and propane mixture. It uses an arc generator to generate a spark across the arc gap in front of the burner. It uses a flexion sensor to determine how far back my hand is. The flame intensity corresponds to how far back my hand is.
If you look on this page you can see his notes, schematics and drawings for the Prometheus Device. It shows a good amount of creativity – a little like the main character in the Iron Man movie. Perhaps he will create himself an entire suit eventually.
See also:
- How to build a mini flame thrower
- How car flame throwers work
- How microcontrollers work
- How does the lighter in a BBQ grill work?
- How does a spark plug use voltage to ignite a spark in car engines?
- How grills work
From:
BrainStuff Blog
How to spend $47,000 on dinner
November 4th, 2009 by Marshall Brain
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This is surprising, in an OMG kind of way:
According to the page:
This is an actual receipt from Nello’s in New York City. The customer was Russian billionaire Roman Abramovich, who had no problem dropping 47k on food and drinks for himself and five other people.
The receipt opens up several questions, the first being , “What is Nello’s”. It is an Italian restaurant in New York City, about two blocks away from the Apple store on fifth avenue:
Here is a typical review:
While the food is excellent—not only those beets, perched delicately between sweet and savory, but also pastas like a penne rigate with brightly anise-flavored sausage—eating is not a particularly important activity. What counts at Nello is being seen at Nello: seen in your Chanel, your St. John’s knits, your tailored Italian suit; seen canoodling on the banquette with your co-star; seen escorting your grandson to a lunch he’ll ignore in favor of watching Spy Kids on his personal DVD player.
If you have ever eaten at a nice restaurant in New York City, the prices for the entrees are not extraordinary. So what is driving up the price? It’s the wine.
First there is the Tawny 40, which must be the Two Buck Chuck of the billionaire world. This page describes Tawny 40 as, “One of the most complex wines on earth the Taylor Fladgate 40 Years Old Tawny exudes aromas and flavors of vanilla creme decadent toffee and persistent dried raisins.” Apparently it was on sale or billed incorrectly at Nello’s, because it is $150 a bottle at wines.com.
Next is the La Tache Romanee Conti at $5,000 a bottle. It comes from the Domaine de la Romanée-Conti vineyard in the Burgandy region of France. This page mentions that, “Old bottles of Les Gaudichots can also be found and sell for vast prices, such as US$ 88,125 for a case of the 1929 vintage.”
Chateau Petrus is “the world’s most expensive red wine” according to this page:
The reason?
What distinction allows the wines of Pomerol and Château Pétrus in particular to command such outrageous prices? Certainly the usual market factors play a huge role: There’s not much product and lots of wealthy wine lovers who will pay whatever these wines cost. But there’s more to it. The geography of the vineyard of Château Pétrus is unique, even among the vineyards of Pomerol and St. Emilion…
It’s a pretty interesting article. It actually has to do with the geology of the region.
Finally the Cristal Rose is a Champagne:
One of the finest Champagnes I have ever brought to my lips, the 2000 Cristal bursts from the glass with fresh hazelnut and apple scents. Elegant, deep, and silky-textured, this medium to full-bodied beauty is immensely concentrated, pure, packed with apple flavors, and astoundingly long in the finish.
(Robert Parker 98 points)
What about the Truffle Tagiolini for $585? That appears to be a simple pasta dish, with the price driven up by the truffles. You can actually make it yourself if you would like to try it:
Truffle tagliolini with local chanterelles
You can see on this page that white truffles from Italy are a bit pricey right now – $3,440 per pound.
And then there’s the last line on the bill – the tip. $7,328.20. Probably not a bad place to work if you are a waiter or waitress.
For more info see:
- How Winemaking Works
- How Tipping Works
- Roman Abramovich
[[[Jump to previous How To - How to dub yourself into a Hollywood movie – Yoostar]]]
From:
TechStuff Blog
T-Mobile Outage Left Me in the Dark
November 4th, 2009 by Jonathan Strickland
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Last night, I attended a performance of Star Wars: In Concert. As I arrived at the venue, I saw that my HTC-G1 had no reception. That’s unusual — T-Mobile’s coverage in Atlanta tends to be pretty strong. I met up with my wife and we took our seats. Her cell phone, also on T-Mobile, still had reception. But she noticed that she wasn’t able to send text messages. Something was definitely odd.
As John Williams’ music filled the arena, I couldn’t help worrying about my phone. The last message I saw as I tried everything to check the connection (including removing and replacing the battery and SIM card) said my SIM card wasn’t registered with the network. I wasn’t sure what that meant. I listened to the oppressive opening notes of The Imperial March, looked at the enormous image of Darth Vader staring at us from the massive screen behind the orchestra and began to worry that my phone had turned to the Dark Side.
As it happens, I was one of thousands of customers affected by a service outage. T-Mobile customers across the United States began having trouble with their service. I was one of the lucky ones — by the end of the concert, my service had returned. But some people are still experiencing problems with their phones.
From:
Stuff You Missed in History Class Blog
The Feral Child in George I’s Court
November 4th, 2009 by Katie Lambert
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Peter the Wild Boy appeared to the world in 1724 in Hamelin in Germany. Like an animal, he was said to have walked on all fours, even though he was a 12-year-old boy (or was it 13? 15?). He ate moss and climbed trees like a squirrel. He was naked and couldn’t talk and was frightened of humans.
George I took in the little wild boy, and London society was absolutely fascinated by him (much like we are with Balloon Boy, if this year’s Halloween costumes are any indication). At court, he ate fruits, vegetables and raw meat and hated wearing clothes. He became a present for Princess Caroline, who had him dressed in special outfits and gave him a watch.
No one knew where Peter came from, or how long he’d been in the forest, though creative minds said he was nursed by a bear from birth.
But the question about Peter that still isn’t answered is this: If he simply wasn’t able to be like everyone else, was it due to his time in the forest, or was it something within Peter himself?
From:
BrainStuff Blog
How to dub yourself into a Hollywood movie – Yoostar
November 4th, 2009 by Marshall Brain
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A friend of mine showed me this:
It is a system that lets you dub yourself into scenes from Hollywood movies and TV shows. And it does a reasonable job without a lot of hassle, as seen in this demo video:
There is a gallery on their web site that lets you see the results of the process.
Possible Christmas gift for the budding actor/actress or narcissist in your midst.
See also: How Blue Screens Work
[[[Jump to previous How To - How to make homemade ravioli]]]
From:
BrainStuff Blog
If you have seen the Ken Block Trax video and are wondering where the tracks come from…
November 4th, 2009 by Marshall Brain
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Ken Blocks’s Trax video presents a Suburu WRX that looks like it is outfitted for lunar exploration:
If you like the look and the capabilities, it turns out that you can do a conversion like this yourself. The company that sells the tracks is Mattracks.com. What you see in the video is a 105M1-A1 rubber track conversion. More info:
See Mattracks.com for details.
From:
BrainStuff Blog
It’s really going to happen – The first space hotel will open in 2012
November 4th, 2009 by Marshall Brain
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If you’ve been waiting for “space tourism” to really take off, instead of being something that is always in the future, here is the first sign of reality. It’s really going to happen – the first space hotel will open in 2012:
Space hotel says it’s on schedule to open in 2012
It will take a day and a half to reach the pod – which Claramunt compared to a mountain retreat, with no staff to greet the traveler.
“When the passengers arrive in the rocket, they will join it for 3 days, rocket and capsule. With this we create in the tourist a confidence that he hasn’t been abandoned. After 3 days the passenger returns to the transport rocket and returns to earth,” he said.
Fun facts:
- $4.5 million for a 3-night stay
- Price includes 8 weeks of training
- The hotel orbits at 280 mile altitude
The web site if you want to learn more: Galacticsuite.com
















