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  #1861  
Old 17.05.2019, 15:25
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Re: Ask a Scientist

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But the surface variations in the F1 paint would be so negligible that it really wouldn't make a measurable difference. But saving weight, even only a few hundred grams, will make a difference on an F1 car.


in that case, why paint at all?


it's not as if f1 cars are expected to have very long lives. Would there be a way of printing the adverts directly onto the metal and leaving the rest unpainted?
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  #1862  
Old 17.05.2019, 16:32
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Re: Ask a Scientist

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in that case, why paint at all?


it's not as if f1 cars are expected to have very long lives. Would there be a way of printing the adverts directly onto the metal and leaving the rest unpainted?
Good question.

It's not actually metal, but rather composite.

I'm guessing that the paint goes on after the Carbon Fiber is autoclaved because either:

1) it would interfere with the curing of the resin, or interfere with laying up the fibers.

or

2) It would cost too much to get a surface finish on the mold which was good enough to make it look like paint.

Although you spray a boat mold (a fairly similar process) with Gelcoat before laying up the glass matting, the "paint" doesn't have any detail. To place advertising in the surfacecoat before laying up the matting would be enormously difficult, and any flaw would make the piece scrap.
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  #1863  
Old 17.05.2019, 17:59
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Re: Ask a Scientist

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I'd say that a 'theory' is a general framework for making predictions, while a 'law' is a specific rule, typically part of such a theory. Newton's laws are part of the theory of classical mechanics, the four laws of thermodynamics could be said to parts of a general theory of thermodynamics, (itself derivable from the theory of statistical mechanics), etc.

And since we seem to be touching on the topics of proof and reality, there is a lovely aphorism "All models are wrong but some are useful." Utility, as measured by predictive power, is all scientists can ever hope for. Newtons laws are amazingly accurate within the range of sizes that we encounter in our daily lives, but they require adjustment to handle anything sufficiently larger, faster or smaller than human-scale objects. So even these 'fundamental' laws mere approximations - as far as we know, reality itself is always more complex, and often beautifully so.
I was going to add something to this thread, but find that this contribution puts what I wanted to say really well - whether or not the big bang and dark matter/energy turn out to be good models or just BS-
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  #1864  
Old 27.06.2019, 16:18
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Re: Ask a Scientist

I recently switched toothpastes and within 10 days of twice daily use, I had a reaction to the new one. Of this list of ingredients, could someone please give me an idea which could have been a possible irritant so that I can watch out for it in my next purchase?

Aqua (Water), Aroma (Flavour), Chondrus Crispus Powder / Carregeenan, Cinnamal, CI74160, CI77891 (Titanium dioxide), Glycerin, Hydrated Silica / Silica, Limonene, PEG-6, Propylene Glycol, Sodium Alkyl Sulfate / Soduim Lauryl Sulphate, Sodium Fluoride, Sodium Gluconate, Sodium Hexametaphosphate, Sodium Saccharin, Stannous Chloride, Stannous Fluoride, Trisodium Phosphate, Xanthan Gum and Zinc Lactate.
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  #1865  
Old 27.06.2019, 16:28
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Re: Ask a Scientist

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I recently switched toothpastes and within 10 days of twice daily use, I had a reaction to the new one. Of this list of ingredients, could someone please give me an idea which could have been a possible irritant so that I can watch out for it in my next purchase?

Aqua (Water), Aroma (Flavour), Chondrus Crispus Powder / Carregeenan, Cinnamal, CI74160, CI77891 (Titanium dioxide), Glycerin, Hydrated Silica / Silica, Limonene, PEG-6, Propylene Glycol, Sodium Alkyl Sulfate / Soduim Lauryl Sulphate, Sodium Fluoride, Sodium Gluconate, Sodium Hexametaphosphate, Sodium Saccharin, Stannous Chloride, Stannous Fluoride, Trisodium Phosphate, Xanthan Gum and Zinc Lactate.
Could be Cinnamal? Important to rinse your mouth well with fresh water after cleaning your teeth.

Could also be a reaction to a new filling if you had recent dental treatment or reaction to a new lipstick?
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  #1866  
Old 27.06.2019, 16:35
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Re: Ask a Scientist

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Could also be a reaction to a new filling if you had recent dental treatment or reaction to a new lipstick?
No new fillings or treatments since my regular hygienist appointment a couple of months ago. No new lipstick either.
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  #1867  
Old 27.06.2019, 16:53
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Re: Ask a Scientist

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No new fillings or treatments since my regular hygienist appointment a couple of months ago. No new lipstick either.
Then "Hexyl cinnamal allergy
The ingredient is known to cause contact allergy, which means that it can cause an allergic reaction to your skin. Numerous organizations and agencies have found that allergies are hexyl cinnamal's side effect."
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  #1868  
Old 27.06.2019, 16:59
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Re: Ask a Scientist

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Then "Hexyl cinnamal allergy
The ingredient is known to cause contact allergy, which means that it can cause an allergic reaction to your skin. Numerous organizations and agencies have found that allergies are hexyl cinnamal's side effect."
It's plain cinnamal (= cinnamaldehyde) , not hexyl cinnamal (=hexyl cinnamate). However, that's a detail. I agree that this ingredient is the most probable culprit, by far.
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  #1869  
Old 27.06.2019, 17:10
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Re: Ask a Scientist

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It's plain cinnamal (= cinnamaldehyde) , not hexyl cinnamal (=hexyl cinnamate). However, that's a detail. I agree that this ingredient is the most probable culprit, by far.
Wow. That's really surprised me. I was thinking perhaps the Soduim Lauryl Sulphate, but on checking, it's also in my Aquafresh travel size toothpaste that I've used for years. Or maybe one of the Stannous ingredients seeing as that's relatively 'new'.

Total layman second question... But I love cinnamon, or is that not related to the reaction I've had? I had cinnamon ice cream and still have some in the freezer.

Thanks to Frank and marton.
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  #1870  
Old 27.06.2019, 17:23
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Re: Ask a Scientist

More Cinnamal detail here and yes it is in cinnamon!
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  #1871  
Old 27.06.2019, 19:55
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Re: Ask a Scientist

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Wow. That's really surprised me. I was thinking perhaps the Soduim Lauryl Sulphate, but on checking, it's also in my Aquafresh travel size toothpaste that I've used for years. Or maybe one of the Stannous ingredients seeing as that's relatively 'new'.

Total layman second question... But I love cinnamon, or is that not related to the reaction I've had? I had cinnamon ice cream and still have some in the freezer.

Thanks to Frank and marton.
If you were allergic to sodium lauryl sulfate, you'd know it, because you'd be allergic to a majority of shampoos, soaps, laundry detergents, and cleaning products. It's everywhere. It's what makes your toothpaste, shampoo, and other products so sudsy and foamy.
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  #1872  
Old 28.06.2019, 14:44
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Re: Ask a Scientist

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If you were allergic to sodium lauryl sulfate, you'd know it, because you'd be allergic to a majority of shampoos, soaps, laundry detergents, and cleaning products. It's everywhere. It's what makes your toothpaste, shampoo, and other products so sudsy and foamy.
I am allergic to a lot of those things and it's a total ball ache at times because I'm not 'a precious little flower' type of person, but it's been all my life so I'm used to it now. Quite a few of my friends in the UK have also developed adverse reactions to their usual laundry detergents since they were revised to concentrated formulas a couple of years ago. Since I was a kid, my personal nemesis has been lanolin, and I now only use Johnson's baby shampoo because too many other brands cause eczema (diagnosed by my doc last year). Hardly wear make-up because of adverse reactions, but once in a while there's a breakthrough product such as Lily Lolo Mineral Powder cosmetics. That was a game changer for me.

Like I said, it's a ball ache and a time consuming one at that. Just spent all morning researching all the brands of toothpaste commonly available in Zurich, and their ingredients. I could probably sit an exam by now on the pros and cons of triclosan, and why Colgate have chosen to remove it.
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  #1873  
Old 28.06.2019, 14:53
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Re: Ask a Scientist

New question, and a potentially controversial one...

The mother-outlaw in Athens has suffered from post-herpetic neuralgia from shingles for over 10yrs. Her doctor and specialists have said the virus will die with her (charming) and she's not found any treatment that didn't have adverse side effects.

She's 90 next week, and after some research, we were wondering if any CBD oil products could possibly offer her any relief from the pain? We've found legal supplier shops of such products in Athens, but the research is still pretty scant.
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  #1874  
Old 28.06.2019, 15:32
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Re: Ask a Scientist

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...Like I said, it's a ball ache and a time consuming one at that. Just spent all morning researching all the brands of toothpaste commonly available in Zurich, and their ingredients. I could probably sit an exam by now on the pros and cons of triclosan, and why Colgate have chosen to remove it.
If you're not lactose intolerant, have you checked out Zendium?
https://en.wikipedia.org/wiki/Zendium


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New question, and a potentially controversial one...

The mother-outlaw in Athens has suffered from post-herpetic neuralgia from shingles for over 10yrs. Her doctor and specialists have said the virus will die with her (charming) and she's not found any treatment that didn't have adverse side effects.

She's 90 next week, and after some research, we were wondering if any CBD oil products could possibly offer her any relief from the pain? We've found legal supplier shops of such products in Athens, but the research is still pretty scant.
Might be worth a try if she's not found anything else that provides relief. Found this via the goog:
https://www.marijuanadoctors.com/con...tic-neuralgia/

It says certain strains are better for inflammation, so maybe an oil from one of those strains?
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  #1875  
Old 29.06.2019, 13:37
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Re: Ask a Scientist

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If you're not lactose intolerant, have you checked out Zendium?
https://en.wikipedia.org/wiki/Zendium
Thanks for the info. I was lactose intolerant as a kid but grew out of it, thankfully.

Looks like we'll need to get some further advice on the CBD side of things. It's going to be fun trying to convince the mother-outlaw that it's legal, but at this age, I think she'll try anything that gives some relief.
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  #1876  
Old 29.06.2019, 14:13
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Re: Ask a Scientist

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I'm not 'a precious little flower' type of person,
No, you certainly don't come across like that.
Nor am I.

Nor was the GP who finally suggested that I simply cut out ALL skin products. No antiperspirant, no deo, no make-up, no skin-creams nor tonics nor moisturisers, no sun-block, no soap, no shower-gel, no shampoo, no conditioner. He suggested cutting down radically on home-cleaning products, too, no fabric-softener, and hardly any dishwashing liquid or laundry detergent, if any.

Very pragmatically, he said: "Just tell everyone in your circle of friends that you'll see them less for little while, and tell those whom you must see that you'll probably stink for a week or three. In that time, try to wash as little as possible, and when you do, use only water. After three weeks, your body will have recovered from the onslaught of chemicals, your skin irritations will have begun to subside, and your body will have remembered how to self-clean, just as bodies did well-enough for centuries and until a few decades ago, before all these products were invented. After that, you'll be fit to wash regularly again, just using water only."

It worked! His prediction about the duration of the smelly phase was accurate, if a little generous. My skin improved visibly, and feels so much bettter, from within and without. Later, other doctors suggested I use only cloth instead of toilet-paper. That fixed the last of any dermotological complaints. I learnt how much can be achieved, in personal hygiene and in the home, (if water alone or water plus elbow-grease doesn't get things clean), with a little lemon-juice, vinegar, bicarbonate of soda, and mint-water or rosemary-water.

Although I don't feel evangelical about this, when I think back I am amazed at how long I struggled with how much pain and irritation and attempts at obtaining some rest, only to reach such a simple and easy solution. I'm not a complete convert, though, as I've not yet managed to find a comfortable way to care for hair without a dash of shampoo. And I do own some standard household cleaning products, for sparing use, most especially a dishwashing liquid, and some I'd class as belonging with the hardware/craft products.

Every so often, though, I read someone's recommendation of exactly this or that product or chemical, which will precisely tackle a specific kind of dirt in the home, and then I am in awe.
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  #1877  
Old 29.06.2019, 15:25
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Re: Ask a Scientist

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Every so often, though, I read someone's recommendation of exactly this or that product or chemical, which will precisely tackle a specific kind of dirt in the home, and then I am in awe.
Several years of monitoring COSHH reports in an industrial environment was a real eye opener. As for the no products for a week thing, I did that in my late teens (during college holidays) and again in my early 30s when it became apparent that I was growing out of some allergies, and gradually reintroduced the products I needed. It's all trial and error and you think you've got things just right, when someone / some company throw you a curve ball and say that you need a new product (in the case of the toothpaste) or modify the ingredients or concentration of a product you've used for decades, and it's back to the drawing board. And as for certain products that market themselves as 'hypoallergenic'... Pfft! Nearly had an entire holiday ruined by using Nivea's 'Hypoallergenic' children's formula sunscreen, and I'm currently panicking over my dwindling stock of my preferred deoderant, Dove Cucumber green cap, because they've changed the formula to one with a white cap and it burns like hell.

Just got the big five that will never go away, general anaesthetic, lanolin, diesel, dry cleaning fluid and polyester, but I can manage that.
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  #1878  
Old 29.06.2019, 17:21
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Re: Ask a Scientist

Oh, that sounds like a really annoying ongoing strain, and that you have to put in a lot of work for things you feel you really need, or really want.

Maybe I'm luckier in that I can get by not wanting or not needing certain things I used to consider essential. Nowadays, for example, I'd much rather wear a wide-brimmed sun-hat, sunglasses, and a swimming costume with sleeves, (don't care if anyone else might think I look daft) and take refuge in the shade as soon as I come out of the water, than go anywhere near sunscreen again.
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  #1879  
Old 29.06.2019, 17:48
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Re: Ask a Scientist

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Oh, that sounds like a really annoying ongoing strain, and that you have to put in a lot of work for things you feel you really need, or really want.
I don't see it as strain or work, more as a bit of research to get my teeth into which is fun for me. (You haven't seen me booking flights! It's a military operation to get a bargain ) Drives my OH nuts, but I'm a stubborn cow and will not surrender. I must find that needle in the hay stack!

For sunscreen, I usually fare pretty well with the Carroten range in Greece, but many of the big name brands available in Switzerland are a no go. Daylong blue is an expensive option and I fared well with a tester sample, but I've just been reading about the Avene range which has scored stellar reviews across Europe this year, and it's available at lots of shops in Zurich. Mimitika is also looking like a good option, but it's only available online which is too late for our next trip to Greece in a couple of days time.
My ex brother-in-law is a builder and spent half his life slathered in sun screen and sun block, but he still got skin cancer on his lip, so that's another thing I'm overly aware of.
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  #1880  
Old 29.06.2019, 18:17
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Re: Ask a Scientist

Oh, Blueangel, I would really struggle to have you advise me on cosmetics and toiletries, but EVERY time I have to book a flight, I think of you and wish you were doing it for me!
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