John Cuthber
Resident Experts-
Posts
18385 -
Joined
-
Last visited
-
Days Won
51
Content Type
Profiles
Forums
Events
Everything posted by John Cuthber
-
The majority of female humans are too- because they die in childhood (except in the affluent bits of the world which are rare and new so they aren't a factor in evolution). However, unlike most animals, female humans who live long enough to bear children, typically do reach a menopause. That's unusual and cries out for an explanation. One hypothesis I have heard is that our species is so heavily dependent on knowledge and communication that having grandmas around to help is a significant evolutionary advantage.
-
Yes, we know. The question is "why hasn't evolution 'fixed' that?"
-
My first guess would be a piece of aluminium and a piece of copper connected to a meter. Working like a cheap + shoddy variant of this http://jes.ecsdl.org/content/72/1/139.abstract
-
There are two options. Use the stuff as it is to make your final product (in which case the product will need cleaning up) Clean up this intermediate- which will give you a product that's cleaner- but will still need cleaning up to get a pure material. The second course of action will probably give a better product, but the yield will be lower. It's more or less traditional in chemistry that you have that trade -off. You can have high purity or high yield, but not (usually) both
-
Take it down stairs. The increased air pressure will compress it and increase the density. It won't be easy to measure the change...
-
You probably shouldn't be using it for that long. "Use of intranasal decongestants (such as oxymetazoline) for more than three days leads to tachyphylaxis of response and rebound congestion" from https://en.wikipedia.org/wiki/Tachyphylaxis#Other_examples I suggest you check with your doctor. Good point.
-
I don't. Or, at least, they shouldn't be. It may be simply that, if the soil is too dry for the pH meter to work, the plant dies anyway.
-
Zero "Is mutation always cancer?" No. Many mutations are irrelevant.The change is not important. Most would lead to cell death. A few lead to cancer. A tiny tiny tiny tiny tiny tiny tiny tiny fraction might actually be beneficial.
-
The first item is a sprayer/ atomiser. A bit like this one https://www.fishersci.ie/shop/products/glass-laboratory-sprayer/10206621 On the sep funnel the ST refers to standard taper- the size + shape of the stopper https://en.wikipedia.org/wiki/Ground_glass_joint I'm less sure about the ps 6mm I think it refers to the tap.
-
can functional proteins exist by pure chance?
John Cuthber replied to mjs13's topic in Evolution, Morphology and Exobiology
When the Germans were looking for a material to make gas bags for zeppelins they discovered that the membrane of a cow's stomach did a very good job. It's a protein (mainly) with a function- storing hydrogen gas- which came about by chance. Unless you think someone planned it that way, but then you would need to explain who that "someone" is, and that would be off-topic in this bit of teh forum. -
Nope. Plenty are triggered elsewhere https://en.wikipedia.org/wiki/List_of_human_hormones So, you are basing your idea on something that's known not to be true. You can stop now.
-
Well done. You have rediscovered Pythagoras' theorem.
-
Do batteries increase milliamp as long as there is a load?
John Cuthber replied to DARK0717's topic in Speculations
Two things 1 Through what mechanism? 2 Japan. No oil or coal to speak of. Plenty of money. Are they using these magic coils? Why not? Speak for yourself. -
Kerosene is a reasonably widely available choice. Ditto white spirit. However, if you can't get them you have little chance of getting sodium
-
Not where I live. Actually, that's the whole point of the antivaxer argument. You can't scoff at them for not using vaccines if the vaccines are, in fact, ineffective. And it was still shoddy to cherry pick quote like that. How did you come to the mistaken conclusion that it was ignorance on my part? A vaccine that doesn't work and isn't available isn't a vaccine I'm going to use.
-
No. That's impossible. a mole of sodium hydroxide is about 40 grams so 0.3 moles is about 12 grams. There are tables of densities of solutions which might help answer your question.
-
Nice editing. You missed a bit. " It requires four injections, and has a relatively low efficacy" From my point of view this is more relevant than a trial "There's currently no vaccine available that offers protection against malaria, so it's very important to take antimalarial medication to reduce your chances of getting the disease" from https://www.nhs.uk/conditions/malaria/prevention/
-
Yes. We know Well, when we stop vaccinating, the rates of infection skyrocket. That's the extent to which they were held in check by the vaccination programme. Nothing the pharmaceutical industry says can affect the number of sick, blind or dead children that arise from people believing the antivaxer propaganda. So, on one hand, you accept that vaccines work, but you also think they cause things like autism - for which which the numbers don't add up. Did you consider science instead?
-
Do batteries increase milliamp as long as there is a load?
John Cuthber replied to DARK0717's topic in Speculations
I think we should wait for some sort of explanation of why the power stations are not building these. It should be funny. Over to you DARK0717 -
How would you behave if you were a massive giant?
John Cuthber replied to Thrylix's topic in The Lounge
I'd like to think that I'd behave kindly towards the "lilliputians". It costs me practically nothing to do so. I suspect I'd end up worshipped as a God anyway unless they were fairly sophisticated. It's not as if it would be hard for me to help them with major construction work (from their perspective- or sandcastles and dolls' houses from mine). The only "payment" I could expect would be the satisfaction of my curiosity (and maybe a bit of help with splinters etc). Who knows- I might get them to make me a diffraction grating. The tricky bits would be communication and also avoiding accidents. I'd clearly need to sleep somewhere else. Even an ill-timed sneeze would be a problem.