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  1. C

    How does RNA know?

    How does RNA "know" which DNA strand is the template strand?
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    Subshells and transition metals

    I have a question that my teacher can't answer. :( I get that with the electronic configurations for atoms, an s shell fills before a d shell but also empties before a d shell. Okay. So the last couple of subshells for iron are 4s2 3d6; Fe2+ would be 4s0 3d6 and Fe3+ would be 4s0 3d5...
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    Self heating drinks

    A decent chemistry section at your local library, if they have one.
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    Ethanol and cell membranes

    I'm told that ethanol crosses a cell membrane very easily and can screw up the inner workings of the cell. But ethanol is very hydrophilic, so shouldn't it have a really tough time crossing a phospholipid membrane? does it hijack a transport protein or something?
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    Is dog breeding evolution?

    As far as the OP goes, the important thing is how closely breeder selection mimicks a pattern of natural selection -- that is, whether creatures are being selected for their genotypes or phenotypes. For instance, in the early days of cattle breeding (and in most cows today, in fact), breeding...
  6. C

    Germ-line cells

    Of course mutations gather in germ-line cells.
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    Cat urine in pool chemical room

    You could try locking your cat out of the room. Just a thought.
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    Hm turning a sphere inside out what's the point?

    A concept in pure maths can have a use that is not apparent until several decades after it's been discovered.
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    How to melt ice?

    Are you allowed to breathe on it?
  10. C

    [Quick question] A bird's fall.

    It depends on how small your units when measuring time. In a perfect model, there it a POINT in time when the ball is motionless, but this does not take up any AMOUNT of time. Sorry i'm bad at explaining things.
  11. C

    How to melt ice?

    If you're not allowed to physically crush the ice, heat it on a wire rack. Allow the ice to sink into the rack and the water to drop off. But crushing is better.
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    Totally random?

    If the ball is not moving in circular motion, it is not experiencing a centripetal force -- the concept does not make sense. Centripetal force is whatever force causes the accelleration necessary for centripetal motion. Without motion the question makes no sense. It's best to think of in terms...
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    Chemistry Polar molecule

    H2O does not have any double bonds, BTW; its electron distribution is why it's a different shape to CO2 (as Kushal pointed out). Only vaguely related to the question, but an important concept.
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    2 interesting think questions

    That's the same conclusion I reached.
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    Methane from Carbon Dioxide and Hydrogen

    No, no, you're missing the point. Converting CO2 to methane would take more energy than what you'd get out of burning it (the energy used in CO2 --> methane would be equal to the energy gained in methane --> CO2, plus energy would be lost in the process because no process is 100% energy...
  16. C

    Reflux still

    Their boiling points are different. Temperature is the average kinetic energy of the molecules. In your example, a B molecule requires less energy to escape the liquid, so the higher the temperature, the more B molecules will be above their minimum threshhold for evaporation, than A molecules...
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    What the heck is the point of this?

    Why? Because we can. These sorts of things sometimes turn out to be quite useful a couple of decades down the track. A 19th century physicist would probably react the same if you told them about the particle accelerator.
  18. C

    What does a mouse do to recognize its sex partner?

    Females use scent too. A female mopuse will even abort a foetus if she changes partners, based on the difference in smell in her new partner and her old one (and a hormone he secretes).
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    Antioxidents and the free radical theory

    It isn't always easy to extrapolate effects across species, let alone across phyla. Your source isn't connected to a group that markets tea or fruit juice is it?
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    Medical Occurence of medication interactions

    Oh, you mean if you take three medications, is it more likely for any two to interact than for all three to interact at once? So long as you keep the number you're taking constant, basically, the more of those required to interact at once, the less likely of that interaction occurring (this...
  21. C

    How can you make ice sink ?

    But not in the ice, because the salt will not let it freeze. Unless your freezer is set very cold. ;)
  22. C

    How can you make ice sink ?

    Wonder if anybody's ever tried to collect enough tritium and freeze it...
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    What is charge and what are the reality of fields?

    Charge is a property of a particle in the way that taste is a property of a soup.
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    Metal heat

    Photons and heat are different concepts.
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    Rainbows and refraction of light

    jtbell's diagram is a good one. Every droplet separates all colours, but not all colours are going to be at the right angle to hit out eyes. The colour which hits our eyes depends on the position of the droplet relative to the eye (more accurately the agle the droplet makes with the centre of...
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    How consistant are your beliefs?

    You have reached the end! Congratulations! You have made it to the end of this activity. You took zero direct hits and you bit zero bullets. The average player of this activity to date takes 1.39 hits and bites 1.11 bullets. 323868 people have so far undertaken this activity. Click the link...
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    Why value life?

    Dawguard, subjective values aren't contradictory so long as you acknowledge that they are different people. There is no reason why everyone's idea of the value of life have to be the same, because opinions are not inherently true or false. Anyone can make life worthless to themselves by...
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    I want to sell the moon,

    Didn't America claim the moon the first time they went there?
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    We're all going to die!

    I've thought about it and concluded that I cannot prevent death, so there is no sense worrying about it. I have, of course, made necessary preparations relating to my possessions and future use of my organs, but death doesn't worry me particularly. The average life expectancy for women of my...
  30. C

    Scientists and Atheists Should be Moral Absolutists

    What exactly do you mean about not being driven by logic? Yes -- I don't believe in God without evidence in the same way I don't believe in pixies without evidence. Just wanted to point that out. Sorry if I interrupted your conversation.
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