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John Cuthber

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Posts posted by John Cuthber

  1. On 5/13/2020 at 10:00 AM, Carl Fredrik Ahl said:


    I can't find much information about concentrated hydrochloric acid and the uses for it. I find much information about regular hydrochloric acid, for exemaple that it is used to regulare pH in stuff and are additives in food. Can you plz give me some examples of what concentrated hydrochloric acid is used for and how it differs from regular hydrochloric acid.

    If you buy commercial hydrochloric acid- unless you specify a different concentration- you will get concentrated hydrochloric acid.

    Other solutions are made by dilution of the acid.

    The name is not a description of the manufacturing process.

  2. 5 minutes ago, StringJunky said:

    I feel she was trying to find a middle road, which actually probably conflicted with her. She did want to stay in.

    But, it seems, she wanted power more than she wanted to do what was best for the country. So, she went along with Brexit.
    It's not as if she was a great lover of either justice or the european legal system.


  3. 1 hour ago, StringJunky said:

    In war... nice side-track.

    War as a side track from battle...

    On 5/8/2020 at 7:01 PM, StringJunky said:

    John threw in a  false association

    A comparison between Mrs May's xenophobia which caused problems when she was in office and her denouncement of it now.


    On 5/8/2020 at 6:58 PM, StringJunky said:

    At least she's not holding to that principle when it causes a problem. It's called 'pragmatism'.

    That principle caused major problems when she was in office.

  4. 22 hours ago, StringJunky said:

    You took what she was referring to totally out of context. I see no hypocrisy. Two different areas of application. Read this properly and what she's referring to:

    "Nationalism is no ally in this battle without borders"

    She's referring to disease and how it is indiscriminately crossing international boundaries. Nationalism is impotent in this case.

    In exactly which battles is nationalism an ally?

    (note, it's "the enemy"'s  nationalism that starts the unnecessary  battle in the first place.)

  5. 3 hours ago, Sensei said:

    But they are easier to maintain by staff. Dust and dirt do not attach to it so easily..

    Yes and no.

    As soon as anyone walks on it  the surface will get scuffed and look bad,

  6. 2 hours ago, MANDREWS85 said:

    It's currently been commandeered to fight the corona with colloidal silver production.

    That's not a good start, but... whatever. If you  ant to look like a smurf, that's your problem. You have been warned.
    The kit you have is nice enough, you might also need stuff like a soldering iron.
    And a word of warning HP made good kit, but it's rumoured that they dropped the HP name because everyone said it stood for "Higher Prices".
    Probably less of an issue buying second hand.


    We live in a weird world. It's possible that getting a newer computer will let you use new er equipment which is paradoxically cheaper- think abouyt teh stuff made for arduino etc.

  7. On 5/1/2020 at 10:48 AM, bluedot said:

    pretty obvious there are not supposed to be any black dots in the solution

    And yet there are solutions, every bit as valid, that do have black dots.

    I may be wrong, but I doubt it's from a real IQ test.

    They are usually careful to ensure that there aren't too many "right" answers.


  8. 2 hours ago, swansont said:

    We had a high-level person who insisted on stepping over the mats whenever he entered our lab.

    I would put a lot more effort than I should into making the mat slightly bigger each time...

  9. 13 hours ago, swansont said:

    Filtration doesn’t fix that. 

    The HEPA filters used in biohazard labs would fix it.

    The problem is largely the noise from the fans.

    6 hours ago, MigL said:

    I'm only familiar with semiconductor clean rooms, which are not sterile as they are only concerned with particulate contaminants.

    Bacteria and viruses are particulate.

    The ones where they don't allow people are probably pretty near sterile for exactly that reason.

  10. OK, I had a look



    The numbers of dots are 


    That strongly suggests that there are 5 dots in the last box. That rules out answers 5 or 6

    Each box has 4 quadrants- we can call them N,S,E,W
    Solid dots are only allowed in the North and South quarters, but not in the East or West ones
    That rules out answer 2

    Unfilled circles are only allowed in the east or west quarters, but not the North or South ones.
    That rules out answer 3

    So we now have two options, 1 and 4

    In any column, no quadrant is occupied more than once.
    That rules out 4
    (and you can do the same with rows)
    So the only answer left is 1



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