leveni

Thanks elfmotat and altergnostic. My intuition tells me altergnostic is correct but elfmotat has proven, mathematically, the difference in speed between the two photons is c. I guess the next step would be to calculate 'time dilation' and 'length contraction' between the two photons. Would this be right?

photon A<----[light source]---->photon B Two photons are ejected from a light source at the same time, in opposite linear directions, in a vacuum. They are named photon A and photon B. The light source is stationary and Photon A travels at c in a westerly direction and photon B travels at c in an easterly direction. Question A: Immediately after being emitted from the light source, is photon A travelling at two times c relative to photon B? In regards to question A: If the light source is stationary, then relative to the light source then the answer should be yes(Photon A is travelling at 2 times c relative to photon B from the light sources point of view). Question B: But from the point of view of photon B, would photon A be travelling at two times c? In regards to question B: Is this question possible? That is, can photons ever be at rest relative to something else. Do they have rest mass?

Thanks Jake, I'm adding my lists to Wikipedia right now. Once that's finished, I'm going to start on a bell curve to show the range our senses have, and I want to include diseases in this bell curve. I;'m going to start out with a bell curve but the tyope of graph I eventually end up with might be different.

I want to compile data on diseases that affect every part of the senses, from where they are first sensed to when they reach the brain, and also to show some special abilities, eg humans can only see red, green and blue but maybe some women can also see the ultraviolet (http://www.post-gazette.com/pg/06256/721190-114.stm : From Wikipedia)and then figure out how to draw some kind of visual aid, like a bell curve, to show it all. Can you show me a link of the different diseases that affect sensory perception. I have to start somewhere, so why not with that.

I've been looking for diseases, problems and differences in each of the above and can't really find any info. Eg: the number of Olfactory_sensory_neurons we have at the lower end and the higher end, and the disease that affect them. But can't really find any info on it. Any suggestions?

Hi, I'm hoping to do something a little simple, maybe it's only at the high-school standard, in regards to: a: How and from-where information enters our brain, from the outside world.(that is; from our 5 senses) b: How and where in the brain information is dealt with or processes. c: How and from where information leaves the brain, to enter the outside world. eg: speech, facial expressions and other physical actions. I'm just going to post things and hope some body can correct any mistakes that they see. I'll start with a: and then do c: and lastly do b: I'm just doing this for a bit of fun and to get some idea as to what happens in our brain. I what to do this step by step, so as little information as possible is missed. But I don't want to get too bogged down in detail either, because it needs to be readable by lay people, like myself. Therefore, I'll just put links to the detailed bits of information. From the Nose to the Brain Odors are sensed by the Olfactory_sensory_neuron in the Olfactory_epithelium Then go through the Olfactory_nerve (CN1) to the Olfactory_bulb Info then goes through the Glomerulus_(olfaction) And passed to Dendrite And Mitral_cells To several parts of the brain Anterior_olfactory_nucleus Piriform_cortex Amygdala (mating and recognizing same species) Entorhinal_cortex (memory) . . From the Tongue to the Brain Tastes are first picked up by the Taste_bud information is carried by the Facial_nerve (CN 7) and Hypoglossal_nerve (CN 12) and Glossopharyngeal_nerve (CN 9) and Vagus_nerve (CN 10) all these nerves go to the Nucleus_of_the_solitary_tract then to the Thalmus and then to the Cerebral_cortex and also the Limbic_system which contain then Hypothalamus and Amygda . . From the Ear to the Brain Sound enters via the External_auditory_canal Vibrate the Tympanic_membrane Which vibrate the Malleus And in turn the Incus And then to the Stapes To the Fenestra_ovalis Then to the Labyrinth_(inner_ear) Which has the Cochlea Info goes vis the Vestibulocochlear_Nerve Which contains the Cochlear_nerve (hearing info) And the Vestibular_nerve (balance info) Goes to the Primary_auditory_cortex in the brain from there it goes to several other areas in the brain . . From the Eyes to the Brain Light enters the eye hits the Retina Passes info to the Optic_nerve (CN2) Through the Optic_chiasm (cross over part) Through the Optic_tract To the Lateral_geniculate_nucleus Then via Optic_radiation To the Primary_visual_cortex Then to the Dorsal_stream And the Ventral_stream . . From the Skin to the Brain Layer 1 Epidermis_(skin) Layer 2 Dermis Layer 3 Subcutaneous_tissue (hypodermis:has all the special cells in it) Special cells include: Hair_plexus Ruffini_Endings Krause_corpuscle Pacinian_corpuscle Meissner_corpuscle Free_nerve_endings Info goes from one of these special cells to an Axon Through the Dorsal_root_ganglion Via the Spinothalamic_tract to the Postcentral_gyrus I have one question about hunger and thirst, are these senses or are they completely different because they are hormonally based. . .

Hi Ajb, Thanks for your time. I've given up on what I was thinking before. The reason is I think the 2nd dimension doesn't really exist. eg: Something in the 3rd dimension has the volume: x times y times z. If it has volume it exists. But in the 2nd dimension there is no z-axis, z equals zero. So everything in the 2nd dimension will have a volume of zero. x times y times zero equals zero. And the 2nd dimension itself has no z-axis. So it also doesn't exist. So the 2nd dimension is not something that exists, it's just a something mathematicians thought up and use to explain and calculate surface area and vectors. Is this correct? Sorry for taking up your time.

Hi ajb, Thanks for the reply. I'm just reading through all the terminology on Wikipedia. I just looked up 'line' on Wikipedia and have now decided to change the meaning of line back to my original statement, which was the same as Wikipedia's. 'Lines ... have no width or height at all and are usually considered to be infinitely long'

Hi ajb, thanks for the quick reply. I'm going to change Q2 a little, to: Q2. This line, could also never have any depth or height it could only have width. Is this true? If it did have depth it would then be 2 dimensional. If it had height again it would be 2 dimensional. If it had both width and depth it would be 3 dimensional. So if we are looking at the line in front of us, it has width but no depth or height. Just to make the visualization easier. Also for the time being I'm going to limit these questions to an infinite real line. My next step is a little strange. So I'll explain what I'm thinking. I'm thinking how something in the first dimension would perceive it's surroundings. I guess this is entering Metaphysics, and may not belong here, but I'm just trying to look at the 1st dimension from the 1st dimensions point of view. Not my 3 dimensional point of view. This is purely hypothetical because nothing can exist if it has no height or depth, and this is also speculative because we can't really know what or how something would perceive it's surroundings if it existed in the first dimension. Why am I doing this? I am doing this because I have the habit of looking at things from other peoples points of view. In this case it's a kind of mathematical/dimensional empathy, if that is possible. Anyway; Would the equation for the infinite real line be –∞ < x < +∞ (x being any given point on the real line) (noting that the y-axis and the z-axis do not exist in this equation)

Dimensions. I was browsing Wikipedia the other day and had a look at Dimensions. I now have questions about dimensions that Wikipedia didn't cover. I just want to go through step by step in a slow tedious logical manner and obtain a reasonable answer to my questions. Hope someone can help. Q1. Is the 1st dimension just a perfectly straight line on a plane of infinite length that never bends. Or can it also be a bendy line that curves all over the place in 3 dimensions? Personally I think it can only be a perfectly straight line. But need conformation. Q2. This line, could also never have any width or height it could only have length. Is this true? If it did have width it would then be 2 dimensional. If it had height again it would be 2 dimensional. If it had both width and height it would be 3 dimensional. Are these three statements also true?

I'm assuming you mean the bacteria would have to be inside the meteor in order to survive. The next question is how big would the meteor have to be for the bacteria to survive. What's the maximum temperature becteria can survive in?

Everything is possible. What temp does salt water freeze and what temp does the oil freeze? How much energy would be needed to freeze the one that would freeze first? What is your plan? I'm interested.

I spoke with a NASA astronaut about 5 years ago and he had a pretty similar idea. He didn’t go into the detail like you have done. His idea was to have an elevator from earth to space only, for the transport of raw materials from other planets.