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General Science News
#61
(07-13-2014, 11:20 PM)John L Wrote: Here is something genuinely worth while, and I'm glad I caught this. S22

Fart smells have health benefits, according to Exeter University researchers

[Image: fart-cartoon.jpg]

Send this immediately to Al Gore. CO2 is healthy!
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#62
Here is something that really peaked my attention: Vitamin D deficiency increases dementia developing risk.

Quote:An international team of researchers, led by Dr David Llewellyn at the University of Exeter Medical School in UK, has monitored people for six years.

Observing nearly 1650 people aged over 65 unraveled the existence of association between level of vitamin D and risk of developing dementia in elderly people.

All participants at the early phase of the study were not involved in dementia, cardiovascular disease and stroke.

Results of the study showed that people with good levels of vitamin D (1169 persons) had a one in 10 chance of developing dementia, while seventy persons of the group who had been reported with severe vitamin D deficiency were threatened by higher risk of dementia (around a one in five risk of the disease.)

"We expected to find an association between low vitamin D levels and the risk of dementia and Alzheimer's disease, but the results were surprising. We actually found that the association was twice as strong as we anticipated," Dr Llewellyn said

Here is a great example as to why it is not always good to pay attention to all the hype from politicians and some of the science community. Remember all the dire warnings about how getting in the sun is bad because it promotes cancer, especially melanoma cancer? Now, about all that Global Warming...............................S18

[Image: Buv_XULCMAAyzI8.jpg]
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#63
John, I remember being told as a high school student that adults did not need vitimin D at all, and it was a waste of money for anyone to buy vitamin D supplements. (Recently my doctor actually prescribed vitamin D for me, to make sure I have good utilization of calcium, to avoid loss of bone density.) About the same time (back in the 60's), some authorities were also saying that about zinc--then they discovered that zinc is essential, especially for men. But those pompous authorities who tried to deride everyone for wasting their money on unneeded supplements have never admitted they were wrong, never apologized for giving advice that was harmful.
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#64
(08-15-2014, 10:54 PM)Ron Lambert Wrote: But those pompous authorities who tried to deride everyone for wasting their money on unneeded supplements have never admitted they were wrong, never apologized for giving advice that was harmful.

The opinions of experts are more variable than the wind.
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#65
And that is one of the main reasons while I always take anything 'do-gooders' try to hoist upon me with an entire shaker of salt. Its just like all that hullabaloo over coconut oil, global warming, and G-d knows what else. I'm a natural born contrarian, and proud of it. S22
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#66
It appears archaeologists have uncovered another ancient Nazi rest home.
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#67
Wireless provider, Verizon Communications, known for its great coverage, is falling behind its biggest rival, AT&T, in what many are betting will be the next big thing in the wireless industry: connected cars.

Perhaps I am just getting Old Fogies Syndrome, but the need for a connected car doesn't do squat for me. The first thing is that wiring it to be EMP hardened, will be almost impossible. And also, the State will be able to keep tabs on everyone so much easier.

Does anyone else think along my lines here?
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#68
Does everyone remember Galileo's experiment concerning gravity? He dropped two objects of unequal mass from the Leaning Tower of Pisa. Both objects fell in concert to each other.

But what about something like a bowling ball, and a feather? Would they also move together in concert? If you say yes,.....well, look here.



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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#69
you should have used the words "in vacuum" in the post above.... otherwise it sounds like triviality to ignore



Now, about dropping tape measures.... S6
Sodomia delenda est

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#70
(11-05-2014, 01:31 PM)mv Wrote: you should have used the words "in vacuum" in the post above.... otherwise it sounds like triviality to ignore

It got your attention, didn't it? Had I given it away, you may have been tempted not to satisfy your curiosity. S13
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#71
The only reason I checked the clip was to see if there is a cute way to report the author's ignorance of chutes.
Sodomia delenda est

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#72
Well, the interesting thing is that either way it is dropped, one would automatically assume they would not fall in concert, because one has so much more mass than the other one. But remove the atmosphere, i.e. atmospheric drag, and a feather will drop the same as a large object.

Its a great science lesson.
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#73
John, what do you think about this tank? You, who hate tiny turrets? What about having none at all?


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#74
That way, your tankers cannot climb out and run away!
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#75
(12-21-2014, 05:12 PM)Fredledingue Wrote: John, what do you think about this tank? You, who hate tiny turrets? What about having none at all?

Fred, first of all, its not the tiny turret that bothers me. Its the tiny turret, that houses the breech mechanism of a big bore gun that takes up so much space that I don't like. The bigger the gun, the larger the turret must be in order to fully accommodate the back half of that big gun, AND allow the crew to have some semblance of comfort.

Technically the above vehicle is not really a tank, because it lacks a turret. What it is is an assault gun, which was pioneered by the Germans during WWII. It was the Sturmgeschütz that the Swedes are imitating here.

Here's the German StuG III, mounted on a Pkw III chassis.

[Image: 167347938.jpg]

I've studied the Swede vehicle, and it looks great on paper, but personally I don't care for it all that much. Keep in mind that Sweden is heavily forested, and that works to this vehicle's distinct advantage, where larger, heavier tanks would have trouble functioning in heavy woods.

This assault gun differs from the German StuG models, in that the Swede barrel cannot traverse at all. The German's could move about five degrees to the left or right, and up and down. That made it easier to change targets from a distance, more often without having to engage the tracks.

And that is where the REAL vulnerability is not shown to the layman. Its major vulnerability is the danger of throwing a track. And trust me, throwing a track is absolutely the LAST thing any tank crew ever wants to do. Because a tracked vehicle cannot perform its mission with one of its tracks lying on the ground. All it can do is turn in circles.

There are three things a tracked fighting vehicle is supposed to be able to do if it is to survive in action. And those are being able to "Shoot, Move, & Communicate" And if you are not able to move, you are a sitting duck. The crew is forced to expose themselves by getting out and spending considerable time putting the track back together. And a broken track almost never has the two ends close to each other. One end usually winds up, on the ground, pointed away from the main body. That means the track has to be lifted up and slid on to the drive sprocket from the rear, or the idler wheel from the front. And that usually requires more than one tank crew, because the track is HEAVY.

You will not believe the experiences I had to endure as battalion motor officer in my tank battalion over in Korea, and usually after midnight too. Tank tracks creat loads of mud, and having to go out late at night and help a company get a 60 ton tank moving again is a cold, and filthy process. I hated it.

That's why all that moving sideways, pushing down trees, or zigging and zagging back and forth is a definite NO-NO, and just watching that vehicle do all that makes me cringe. Because I guarantee you, even those Swedish vehicles break a lot of track, playing around as they have to do.

I'll take a little extra height, just to have a turret, any day of the week. Just don't make me have to unduely stress those heavy tracks with all those many parts, just waiting to come apart under stress. I'm serious as a heart attack here. S4
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#76
Here you go Fred. Try getting out and repairing a tank track fiasco like this, while all sorts of hash is flying around.

[Image: HitTrack.jpg]

[Image: TkSlipry30s.JPG]

And note how the crew always seems to take a bad situation, and screw it up even more. Note that the tank threw the track, and the crew kept trying to act as though nothing happened. This only makes things worse, and then battalion maintenance has to come in and pull someone else's fat out of the fire.

Or how about this. This is almost always guaranteed to cause a track to break. Try repairing a track in all that mud. That is a tanker's worst nightmare. Welcome to the wonderful vacation land of Grafenwoehr, Germany.

[Image: Tks2Stuck30s.JPG]

Now, just imagine that Swedish assault gun performing unnatural acts, on a regular basis, just to align its gun in order to shoot at the enemy. S18
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#77
Ok, I see. ... and even when you can collect all the elements of the track, and reassemble them together, the loop is always too short to be put back on the wheels, like it's not elastic, right?
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#78
(12-28-2014, 06:12 PM)Fredledingue Wrote: Ok, I see. ... and even when you can collect all the elements of the track, and reassemble them together, the loop is always too short to be put back on the wheels, like it's not elastic, right?

Well, there is one of two things you can do Fred. Actually three things. The worst case is to have the VTR(vehicle track recovery) tow the tank to a safe place before fixing the track. Or, an extra link could be added to the track. Tanks always carry at least one extra link.

But there is another, easier way to get this fixed. Usually on a tank, the idler wheel can be adjusted so as to loosen or tighten the track tension. Here's an idler wheel at the front of the tank, that is being adjusted so as to make the proper track tension.

[Image: tank4.jpg]

If the crew above loosened the idler wheel tension, they could reconnect the loose track, and then retighten the tension. And then off they could go.

Here's something interesting that a non-tanker wouldn't ever note. If you look up at the German assault gun above, you can see that the idler wheel in on the rear of the vehicle, And the drive sprocket/wheel is located in the front. Do you know what this means? It means that the drive shaft differential is in the front of the vehicle, where the driver sits.

But note that the engine is in the rear. That means there has to be a drive shaft going from the rear engine, up to the front of the vehicle, and then engaging the differential, which in turn turns the the drive sprockets, which turn the track. Doesn't make too much sense to me because it has to run up through the crew compartment. I wonder why they didn't have the drive come right off the engine, and on to the rear wheels like with most armored vehicles.

You see, I notice those things immediately, when others don't. There are a whole lot of little things that can make or break a heavy vehicle set up for combat. I still don't understand why the differential is in the front, next to the driver, but for certain, the PkwIII tank was set up the same way.

I'll have to research this for my knowledge base. S6
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#79
Maybe they thought that front traction/drive (not sure how to name it in english) matters on tracked vehicles like on cars...?
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#80
(12-29-2014, 07:35 PM)Fredledingue Wrote: Maybe they thought that front traction/drive (not sure how to name it in english) matters on tracked vehicles like on cars...?

Fred, in one of the articles I went to, there appear to be two distinct advantages of having the drive sprocket in the front. This means the weight of the transaxle(transmission) and differential, may balance the weight of the vehicle, while offering protection to the driver.

But also, the front drive sprocket would not allow a broken track to run off the tanks wheels, as in the picture above. The drive sprocket would be locked into the track, and this would not allow it to slide forward, along with the initial forward motion of the tank. If the sprocket was in the rear, and the track broke there, All the tack back there would unwind out the front, making repair very difficult.

And believe me, a broken track is the number one mechanical problem with tanks. They break more than anything else. But a good tanker rarely has that happen, because he is constantly inspecting them and adjusting them. I never had a track break on me, because I had so much terrible experience with fixing other's mishaps as Motor Officer. S5
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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