gib65

Yes, but where was that photon before it was emitted? Was it created at the moment of emission?

So then what happens when the electron emits the photon? Is the photon created ex-nihilo?

So then is the problem solved by saying m=0? That would mean F=0, which would mean it takes no force to get a photon moving, which means that a could be anything (even infinit), which means it could go from 0 to c in no time. Is it right to think of a photon as at rest before it is emitted by an electron (or at least going at the same speed as the electron)? Is the photon 'in' the electron?

When a photon is emitted from an electron, is it instantly traveling at c? Doesn't this contradict F=ma*? Or, in other words, doesn't an object have to accelerate if it is to go from one speed (such as rest) to another (such as c)? *I know photons can be considered massless, but then why are they pulled down by gravity?

What do you mean by this? How is "most of its mass" at rest at any point in the spaceship's travels? And how does this solve the paradox?

I'm in a discussion on another forum. The topic is relativity and length contraction. I'm trying to explain to someone that anyone who measures something moving will also measure length contraction. This was meant to correct a common misconception about relativity - that since certain measurable quantities dilate as one's speed increases (time slows down, length contracts, mass increases), those quantities would have to seem to dilate in the opposite direction from the point of view of the one moving. In the case of this discussion, my interlocuter assumed that if someone traveling in a spaceship close to the speed of light undergoes length contraction, then relative to him the entire universe would have to seem to undergo length 'extension'. I tried to correct this by saying that relative to him, the universe also would undergo length contraction because it would be moving relative to him. Then he stumped me: it should therefore be theoretically possible to arrive at a speed sufficiently close to c such that the entire universe seems to contract to shorter than the length of his spaceship. The front end would essentially have shot passed his destination and the back end would essentially have regressed behind his point of origin. How does one resolve this paradox?

So I'm getting the impression that the answer is that added junk food on top of a complete diet of one's daily requirements would not decrease one's energy levels (not in the short run anyway). Please note (just so there's no confusion): I'm not talking about how much energy one takes in but how 'energized' one feels. Compare a day of drinking coffee with a day of abstaining. If all else is equal (i.e. same food intake), the coffee drinking day would count as 'high energy' in my thinking even though on both days the body takes in the same amount of energy.

Hmm. I would assume though that if he is to get most of his carbs from junk food, he'd have to take some vitamin suppliments, no? I mean there's more than just carbs to consider when trying to boost up one's energy, right? I heard B6 and B12 are very important.

Some junk foods provide fat, but others provide sugar (eg. candy bar). Are you saying so long as he consumes enough carbs (whether from health foods like fruits or junk foods like candy bars), his energy levels will be up?

It's common knowledge that eating healthy gives you more energy. So here's a question: does eating junk food reduce your energy even if you've taken your daily requirements of health foods? For example, suppose for a full day, someone ate a balanced quantity of fruits, vegetables, whole grains, lean meats, and lean dairy products. He ate the required daily amount for someone of his type. He's getting enough good quality sleep and he's staying away from drugs and alcohol. If on top of all that he had a fair amount of junk food (say a bag of chips, some pop, a donut, and some buttered popcorn at a movie) would he still have his energy levels up at what they would be if he cut out the junk food or would the junk food push down his energy levels (even though he had the full amount of daily required health food)?

This is kind of a hypothetical question, so don't read anything into this about my actual life style: I'm just wondering if it makes sense to talk about being overweight yet healthy at the same time. I'm thinking particularly about snacking on health foods - fruits, whole grain breads, low-fat dairy products (milk, yogurt, I don't know about cheese), low-fat meats (particularly fish), etc. If one was always hungry and always wanted to snack, could he/she maintain his/her health by snacking on healthy foods such as these? Let's add a bit of exercise in there since I know exercise is essential for any healthy lifestyle, plus good quality sleep, abstaining from drugs and alcohol, and all the other good stuff... or would you say there can be too much of even the healthy stuff such that it actually deteriorates your health?

I would think so, but I would think it's true of all fruits and vegetables. I was wondering if there's anything particular to do with grape fruit and tomato juice.

Yeah, maybe 'natural' was a bad choice of words. What I'm looking for can be summed up as follows: So fruits, vegetables, vitamin pills, etc. I'm also looking for something that won't harm me in the long run if I take it on a daily basis.

I don't think I want to jump from caffeine to prescription pills. I'm looking for something to which I won't develop a tolerance. Do you know of any products that contain the vitamins and supplements you mentioned (vinopocetrine, gingko biloba, etc.)?

If I wanted to give up caffeine and get my energy boost from more natural sources (fruits, vegetables, vitamins, etc.), what would you suggest? I understand it would be extremely difficult to get the same kind of boost from natural non-caffinated substances, but I don't need the same kind of boost (quality and quantity), just something so that I'm not dragging my ass around all day. Any suggestions?

A lady told me that she substitutes grape fruit and tomato juice for coffee. She says its a real energy booster. She drinks a full glass of grape fruit juice in the morning and then at noon she has two glasses of tomato juice with her lunch. Now I doubt this can have the same stimulating and energy boosting effects as caffeine but I'm wondering if there's anything to the claim that grape fruit juice and tomato juice can boost one's energy to even a small degree.

Does it? Also: if its primary function is to boost the immune system, does it work on pretty much any virus (ex. stomach virus)? Does it work on non-viral illness that the immune system can do something about?

We've had the tree for a while now and I've never reacted to it on Previous Christmases. The medication I got for the pink eye was sold out in 2 out of 3 pharmacies; that coupled with the fact that in the doctor's waiting room was a kid also with pink eye tells me that its something going around. I'm pretty sure it's an extremely versatile virus or several viruses going around at once (in the latter case, it could also have started with an extremely versatile virus that tends to mutate frequently and therefore ends up being several viruses going around simultaneously). I just wanted to know more about viruses to see if this line of thinking is plausible.

It started sometime before December. I came down with some mild cold symptoms. Then, as soon as I thought I was getting over it, I got the stomach flew for the first week of December. The first night I was puking all night. The next day I was okay (i.e. I could function). Then, on the third day, I started getting stomach cramps and extremely frequent diarhea. The stomach cramps peeked in the middle of the day (they got pretty bad) and then over the next 24 hours or so I slowly started to feel better. For about a week, things started to look better for me until I started coming down with more cold symptoms. They still haven't left. Just yesterday, I started getting mild symptoms of pink eye in one eye. Today, I definitely have it in both eyes, and I'm feeling miserable, like I've just caught the cold virus all over again. In my familly, my wife suffered from terrible cold symptoms for about 2 or 3 days in the week before December. She got over it fairly quickly and hasn't suffered from anything since. My daughter (2 years old) has had major cold symptoms for about the past month, and was throwing up around the same time I had the stomach flew. About two weeks ago, it looked like she had pink eye in her right eye. Today, she's getting better but still has a runny nose and a cough. So based on this description, what do you think is happening to me (or any of my family members)? It's obviously more than your typical cold virus. It seems to come back repeatedly with a vengence; as soon as I think I'm over it, it comes back and in different forms. Is it one virus that happens to be prone to frequent mutation? Is it several viruses at once? Is it one virus that so happens to manifest different symptoms at different times?

I've heard the term 'spot detector' thrown around in some of the brainscience literature, but I vaguely remember learning in university that there are no spot detector neurons in the brain, only on the retina. So my first question is: are there or are there not spot detector neurons in the brain? My second question is: if not, then how are we actually able to see spots or know about them? Doesn't being conscious of something require some kind of brain processing of that information? Doesn't the brain have to have some kind of 'detector' mechanism in place in order for us to perceive whatever's being detected? When I look at the stars I surely feel like I'm seeing spots (or points). Same with pencil marks on paper. What brain area is responsible for my perception of these things if not spot detectors?

I see, So, in other words, if I'm taking Cold-FX to combat my cold, I shouldn't stop just because I've regained my energy. And I certainly shouldn't go out drinking (I've heard alcohol weakens the immune system).

I see, thanks for the info both. So what does it mean when I've regained my energy after 2 or 3 days. Does it mean anything, or is it just that one of the symptoms has abated (i.e. it's not a sign that the body is making any progress in fighting the virus)?

How do cold viruses work? Everytime I have a cold, I notice there's 3 phases I go through. For the first day, I have this uncomfortable sensation in my nasal cavaty. Then for the next two or three days, I'm totally out of energy and feel like shit generally. Then for the next week or two, I regain my energy but have to deal with a runny nose and a pesky cough. At what point has the body "defeated" the virus? Is it when I've regained my energy? Or is it when all the symptoms (runny nose, cough) have dissappeared? Are the symptoms just the body's way of getting rid of dead cells and viruses? Is there a chance, after the two/three days of lethargy, that the virus could regain the upper hand, or is it a certainty that the virus is dead and won't come back again? I'll start with these questions, but I have others which I'll ask later.

That sort of implies that anything we're going to see in the future (assuming it's useful) has already existed. If it's useful, it's been done <-- as that you're argument? Also, I'm not sure it would be useful. Isn't it useful for people to be able to hide their thoughts? Would it be useful for the species overall if a select few could inundate the minds of others with their thoughts? Maybe it would, but I wouldn't be do quick to judge. Lastly, are we sure that there aren't some species on Earth who do communicate telepathically. Do we know what signs to look for as evidence? Only a century ago, we had no idea dolphin's communicated with sonic pings. Did we know to look for that? Did we bother? Have we bothered to think about what the signs would be of other species communicating telepathically (let alone actually looked for those signs)? All in all, you're probably right, but I'm always one to ask the question: do we know? How do we know? And it's rare that I can ever settle on a yes/no answer.