the guy

In the case of soft tissue calcification of the throat or larynx, or calcification of cartilage such as thyroid cartilage, how long can one expect it to last? i.e: is it a permanent, long lasting, or just temporary condition? I came across it whilst doing some reading and my curiosity was stirred, but I cannot find an answer to my question anywhere. Thank you in advance for any answers.

When the body has developed an immunity to a particular strain of virus, either through past infection or vaccination, and the virus enters the body once again it is obviously overcome before it can have any harmful effects. What I was wondering is whether such viruses manage to infect any cells before the immune response takes effect, or if they are totally overcome before this can happen?

I need to produce a nice steady stream of pure nitrogen for and experiment. Could anyone suggest the easiest (both in method and in availability of materials/chemicals) and safest method for preparing nitrogen for this? thanks in advance

I've been pondering over this in my head for days now, and still can't decide upon what is the correct assumption. If you were to hold a horseshoe magnet over a magnetic material (let's say iron) with both poles facing down, and the slowly turn it clockwise, would the poles of the iron molecules (excuse my leyman terms) eventually come to align in a circle in the direction of movement, or would they constantly reverse as the next pole passes over them? Please put my mind at rest. Thank you in advance for your answers.

ah right ok cheers, that makes sense.

Ok but if I were to focus the beam onto a thermometer what would it read?

Does anyone know the temperature of the beam that a DVD writer laser diode (200mw, 650nm) produces?

Quick question, Am I right in thinking that if both the probes of a voltmeter were immersed in one beaker of salt solution, the voltmeter would show small fluctuating readings of potential due to the movement of the ions in the solution? Or does it not work like that?

Once a new strain of common cold (human rhinovirus) had arisen in one place, how long do you think it would take; in this day and age of travel and over-population; for it to have spread all over the planet?

When I set my multimeter to the DCV 200mV setting and then move the probes around through the air, I get fluctuating readings. It is only when one or both of the probes are in motion. I'm sure there is a perfectly simple explanation but, pray tell, what is it?

One of the major toxins in bracken (particularly the fronds) is ptaquiloside, which is known to be very carcinogenic. Doing a lot of woodland work, I spend a lot of time handling bracken, and often end up with the juice from the fronds on the skin of my hands. I'm not particularly bothered by this, but it got me wondering, does this mean I run an increased risk of getting skin cancer on my hands? And, should I be more worried (and therefore take safety precautions)?

there are plenty of substances that will expand upon contact with water, but are there any which contract/ shrink/ shrivel etc?

is there a way of doing it which doesn't involve buying a tablet press?

i want to make some alka seltzer tablets as part of an experiment. it's easy to make the powder by mixing citric acid and sodium bicarbonate, but how can i make that into tablets?

i'm not sure about an estimate, perhaps you could help me with that? basically the generator is a linear electric generator. the sliding magnet is small and cylindrical (1cm diameter, 1cm length). i don't know how many turns there will be in the coil but i aim for as many as possible. the catch, however, is that the sliding magnet is not a permanent magnet itself. It is magnetized on demand by a close proximity external magnet (a super-strength neodymium magnet). However i am no good at physics calculations, i was simply hoping to use a sensitive measuring device to see if anything was generated and how much. but if you could help me with some predictions i would be very grateful.

ah, thank you kindly

i'm not sure, here's the website: http://www.first4magnets.com/super-strength-neodymium-magnets-2-c.asp it's the middle magnets on the top two rows

i am constructing a small home-made electrical generator as an experiment. it is very small and so will be low output. what should i use to test it? should i use a voltmeter or an ammeter? and where can i purchase one which will be sensitive enough?

i am looking to order some super-strength magnets, but i am confused by something it says on one product it says: '26kg pull (South)' and on another, otherwise identical product, it says: '26kg pull (North)' what is the difference between these two magnets? surely they both have a north and a south pole...?

ah ok thank you very much

can you purchase ready made solenoid coils for diy purposes? if so where? it needs to be as many turns as possible but i also need to be able to pass a 1cm diameter rod through the middle of it. i just don't like the idea of having to hand wind it!

ah yes sorry, it is a closed loop of pipes, so basically just a tube, in the shape of a square. sorry for the confusion i simply said square because it was easier to describe the heating of one side and the cooling of the other. yes sorry. and MigL, i was thinking along the lines of it all staying in liquid form, not vaporising, but judging from what Joatmon said i'm guessing it would still work? thank you all for your answers, very helpful!

Thinking about convection currents. If you had a closed-loop of pipe full of liquid, in the shape of a square, stood it uupright, and then heated the left vertical side whilst cooling the right vertical side, would the liquid flow in a clockwise direction? Rising in the left side and sinking in the right etc? If not, could it be made to do so by maaking some kind of adjustments to the set up?

if you invent a printed puzzle, can you protect it? (for sake of example; the sudoku has never been thought of before, and i come up with it whilst doodling over breakfast) if so, how? i.e. what form of intellectual property does it come under? thank in advance for any answers

when sodium hydroxide 'digests' keratin, what are the products/ what is left?