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3:14 PM
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1. How do you know string theory is true?
The simple answer to this question is: we do not yet know whether nature is described by string theory or not.
2. So, why are so many scientists working on it then? Isn't it more important to work on theories of which we know they are true?
Scientists work on string theory because they believe it has a very good chance of being true. In other words, the theory is compellingly beautiful and resourceful, to experts, and it is convincingly consistent. Moreover, it addresses problems that theoretical and other physicists believe need to be examined, and it does this in rigorous fashion. All these scientists believe it is also important to work, for instance, on delving deeper into the guts of the quantum field theories of the standard model (i.e. a theory which has been experimentally established), but they have chosen to follow an alternative path. There is a much larger community of physicists that do work on theories that are known to describe nature accurately. Some try to go beyond this framework, because this has been proven to be instructive, useful and interesting in the past. That is well-established methodology.
3. Why don't you just do the right experiment, and check whether string theory is true or not?
We should consider the fact that we have continuously tried to heighten the energy scale at which we can do experiments. This becomes more and more difficult to realize. If a new particle accelerator is constructed, we are happy with a gain of a factor of ten in energy scale -- a lot of new physics can be hidden in the new energy range that will be accessible to us after it is operational. But, this costs a lot of energy, money, time, knowledge, engineering skill, etc. We should not underestimate the resources that we put into this enterprise.
Simultaneously, string theorists try to lower the energy scale at which string theory can predict spectacular new phenomena. We're happy each time we can pinpoint a new peculiar phenomenon that would be indicative of the existence of strings, and that could be observed at relatively low energy scales.
But, the gap between theory and experiment is still large in the sense that the new phenomena that string theory predicsts MAY happen at low energy scales (i.e. energy scales that we will soon be able to access with sufficient political and public support), but that this is not guaranteed to be the case (i.e. the energy scales at which these spectacular signs would pop up could be much higher than the ones that will be accessible in near future experiments).
Moreover, it should be stressed that even when string theory is verified, we wouldn't claim to have solved all problems in nature. Perhaps string theory will be our best approximation to experiment at some point -- we should be aware though that presumably new theoretical problems will then be discovered on the horizon -- in fact, we can already discern some now, and we are already trying to address them. We should be weary of people predicting the end of physics, the theory of everything, or the answer to the question of life, the universe and everything. Therefore, a statement as: "I know string theory to be true and final" cannot reasonably be expected of a serious scientist. Clarity does not always spell truth, and the truth is not always cristalclear. Perhaps this is one of the reasons that trained scientists have a reputation of being vague, careful, slow and deliberate.
source: http://tena4.vub.ac.be/beyondstringtheory/faq.html
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11:32 AM
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Is string theory true? What are its applications? ... How practical it is?
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12:14 PM
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5:45 PM
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Wat Phnom in a 1900's drawing from the Paris Exhibition
Ox carts transporting soil to fill up the low lands for construction (1891)
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8:40 AM
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Numerous reports have named
Covering 530 sub-national areas of
While the results largely correlate with commonly held views on vulnerability in the region, there are a few surprises.
Landlocked
The map also shows that mega-cities such as
Herminie Francisco, director of EEPSEA and co-author of the mapping report, says local governments should consider taboo issues including resettlement - moving people out of the city - and controlling the inflow of people.
All regions of the
Other regions regarded as most vulnerable include
One limitation of the map is that it's based on past data. It doesn't include projections, and some say analyzing the situation as it is today won't be enough in the face of rising disasters.
But while these concerns may be legitimate, Francisco argues the map - unlike some of the countries it depicts - can adapt to changing realities.
"If we have newer data that will give us new information...we can easily generate the map that corresponds to (that)," said Francisco. "It shows the essence of what vulnerability is, but is simple enough to accommodate new information."
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12:27 PM
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10:36 AM
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Over 75 percent of Cambodians live under poverty line (Jan 2008)
According to the latest official statistics, 35 percent of Cambodians live below the "national poverty line", which is defined as $0.75 of income a day. But if the poverty line is raised to $2 a day, which is the level used to measure poverty in most developing countries in Asia and Africa, 77.7 percent of Cambodia's population live under this more realistic poverty line. The 35 percent of Cambodians identified above through our "national poverty line", are actually those who survive under a "starvation line" of $0.75 a day.
Nearly 80 percent of Cambodians live under poverty line (March 2009)
Government and aid officials claim that the percentage of Cambodians living below the poverty line dropped from 47% to 35% between 1996 and 2006. The fact is that, during that period, the “poverty line” used to assess the number of poor people and defined as a threshold of daily income, was surreptitiously lowered from US$1.00 to US$0.75. Had the “poverty line” not been changed, the percentage of Cambodians living with less than US$1.00 a day would be close to 50%. Moreover, had the “poverty line” been set at US$2.00 income a day as it is in the Philippines and some African countries, the percentage of Cambodians considered as poor would be 77.7% according to the UNDP. See “Over 75 percent of Cambodians live under poverty line” (KI News, 13 January 2008).
Poverty to worsen in 2009 (March 2009)
Given the population increase, inequality in revenue distribution and gross misallocation of resources in Cambodia, a minimum 5 percent annual GDP growth is required to prevent poverty from worsening. For 2009, the IMF has predicted that Cambodia’s economy would shrink by 0.5%, meaning a negative growth leading to a marked increase in poverty.
Sharp drop in customs revenue (March 2009)
In the 2008 state budget, the Customs Department accounted for over 60 percent of all tax revenue, which is a relatively high figure in the region. For 2009, it should collect US$585 million, a figure that now looks impossible to achieve given the ongoing economic slowdown.
For the first two months of 2009, customs revenue reached only US$64 million compared to US$86 million for the same period last year, which represents a 25 percent drop [adjusted for the collection of a US$7 million duty pertaining to 2008].
State budget for 2009 in jeopardy (March 2009)
The government will soon be obliged to revise downward the state budget for 2009 that was adopted last December because it is unable to collect the projected revenue. See above news “Sharp drop in customs revenue” while knowing that the fall in revenue also holds for other sources of income. The projected 2009 budget amounts to US$1.75 billion compared to US$1.37 billion for the 2008 budget, representing a 28 percent increase. This 28 percent increase will likely evaporate and be replaced by a decrease instead. Cambodia is facing the world economic crisis with a collapsing budget, let alone a strong budget with an appropriate economic stimulus package.
Cambodia losing competitiveness because of its dollarized economy (March 2009)
A dollarized economy puts Cambodia in a weak position in the face of the global economic crisis. The fact that Cambodia’s currency, the riel, is pegged to the US dollar is putting pressure on its economic competitiveness as its neighbors’ currencies (Thai baht, Vietnamese dong) depreciate vis-à-vis the US dollar. Little can be done about this in the short term since 95 percent of Cambodia’s money supply consists of US dollars. Paradoxically for the poorer country, the cost of living is higher in Cambodia than in Thailand and Vietnam. For instance, a factory worker can live on a monthly salary of US$60 in Vietnam but not in Cambodia. Cambodia’s economy has been dollarized as a result of weak economic foundations (low productivity, lack of diversification, over-reliance on foreign remittances, shady foreign investors/speculators, cash economy) and poor governance.
Source: 2007/2008 Reports, Human Development Reports, UNDP.
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9:12 AM
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