Dan6541

How long it will take depends on where in the world you live. Here in Australia, it's a very multicultural society. In my class we have a couple of Greeks, an Italian, a Asians, Israelis, and a couple of Indians, so over here race will become less and less important relatively quickly. In places like China it will take a lot longer. It's impossible for me to put a figure on it, but I think it will be a very long time before race it totally irrelevant because of how deeply imbedded some cultures are. I'm no expert but I think in places like China and India there will remain a distinct "race" for a very long time.

I'm not sure about the 85% thing, but studies have shown people with a more positive attitude live longer.

Ok, these structures may be huge, but it wouldn't be the same as living out in the open with wide open spaces. Modern cities are restricting but there are still open spaces, such as parks. Closed-space psychology is interesting. A notable case of this is the miners in Chile, and after a few days some of the miners got depressed. I think, no matter how big the structure is, living in an enclosed space would be horrible, for the first generation at least. It would be intresting to see the second generation and the ones after, and see how different they would be having lived in an enclosed space for their whle life. Of course, people could be let out of the structure, but if your thousands of storeys up, it would be pretty hard.

Is it really an angle if it's zero?

Umm ok, thanks for that.

I read an article in a newspaper recently about this. Basically it was arguing that with the mass migration to cities, the world's human population with stop growing. It said by 2050, the vast majority of people will live in cities, and farming will be taken over by big companies with the help of new technologies. It's main argument was that farmers (particularly poor farmers) have way more babies than people in cities. Oh, and it also said that by then there will be 9 billion people in the world.

That does sound like a migraine. I get migraines a lot, and get the shimmering you described. For me it's a sign that a migraine headache is coming. Do you get any other symptoms, like increased sensitivity to light or sound, or nausea? Even if you don't, I think it would still be a migraine, because I know people who only get the shimmering. Also physical stress is a trigger for migraines, so that would explain why you get it after exersice. Changes in weather and humidity can be a trigger, so that could explain the coast bit. Also there are some links between migraines and warm winds, and also certain odours can bring on a migraine. Maybe the salt smell? I'd say the combination between physical stress (excercise) and the salt smell.

Helium and Sodium are atoms. Molecules are atoms bonded together.

How do you know this? I know this has all been said before but there are HEAPS of planets in the universe and as far as we know only our one has life on it. This shows we have the right conditions for life so why do you say it has to be formed by aliens? It doesn't matter if it Earth needs it or not, it just happened. You could say "why does earth need it?" for many non-living things as well.

If your asking how Legionella bacteria gets in the blood, I assume it's like all bacteria and gets in as a result of infections like pnemonia, as a result of cuts and grazes, and during surgery, or through common procedures like brushing teeth.

Plants use photosynthesis to release oxygen only when there is light, but they release carbon dioxide all the time as a result of respiration. In the day time they release a lot more oxygen than carbon dioxide though. I have no idea about question 2 though.

For anyone who's unsure Cryonics is the freezing of humans or animals for preservation, to be "woken up" at a later stage, as the title sugests. It's an idea that has been used in science fiction while the heroes go on the adventure to other planets. Currently, people pay huge amounts of money for it in the hope they will be woken up some time in the future, when technology has advanced. Around the world 200 people have undergone the cryopreservation procedure. Cryonic procedures usually begin a few minutes after cardiac arrest, and cryoprotectants are used to drastically reduce the formation of ice. In some cryonics procedures these cryoprotectants are used in high concentrations. This allows tissues to cool and solidify without freezing, and is called vitrification. The idea behind the freezing is that memory, personality and identity are stored in structures that don't need continuous brain activity to survive. The big problem is that there isn't current technology that can reverse the freezing. Technology would be needed to repair damage from lack of oxygen being pumped to tissues while the patient is undergoing freezing (the patient has to be declared dead before the process starts so the tissues are without oxygen for at least a few minutes). Technology would also be needed to repair the damage done by thermal stress, the toxicity of the cryoprotectants and the freezing of tissues that don't successfully vitrify. Futhermore, the technology would need to reverse the patients death (usually cardiac arrest). My question is, do you think we can ever expect these technologies to be invented? If so, how long do you think it will take before they are invented?

How awesome does it look? http://news.national...630_600x450.jpg It's going to be sent to the ISS to do dull and dangerous tasks.

Hi everyone, I found this story on the National Geographic website, take a look: http://news.national...024_600x450.jpg Sharpest photo in visible light, apparently. Now we know where Sauron from Lord of the Rings went when his tower got destroyed.

Sure autism is about more than about social skills but I think sending someone with a lack of these skills to a normal school purely because they got a normal score in an IQ test (a test that doesn't test social capabilities) is wrong.

Personally I think IQ tests are overrated. I live in Victoria, Australia, and in this state the government is using IQ tests to determine whether children with aspergers and autism should attend a normal school or a "special" school. My understanding of these disorders is that they affect peoples social capabilities, not their general IQ. So, yes, maybe it is good for a rough estimate but it's being used for purposes that aren't proper considering what kind of test it is.