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Pollen from both environments indicates that temperatures on Antarctica reached up to 21C in summer and were warmer than 10°C even during the coldest and darkest months of the year.

Religion, although it is not the best method of determining moral norms, has often been very effective at promoting them. Religions often satisfy many of Daleiden's criteria for raising people to be conditioned egoists, especially by practicing the aforementioned elements of prosocial training. He suggests that this is what they are doing when they instill a sense of virtue and justice, right and wrong.

Aldous Huxley's novel Brave New World and George Orwell's 1984 imagine dystopian future societies that control the populace by advanced scientific techniques. Harris argues that moral scientists approaching truths does not imply an "Orwellian future" with "scientists at every door". Instead, Harris imagines data about normative moral issues being shared in the same way as other sciences (e.g. peer-reviewed journals on medicine).

Science of morality should identify basic components required for human flourishing, drawing heavily on findings from positive psychology. In a proto-scientific example, Abraham Maslow suggested a hierarchy of needs: basic physical survival, then social and self esteem needs, and lastly philosophical and self-actualization.

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Research looking for optimal ethical systems can draw on all the methods of science, especially those used by positive psychology. While this might include obvious methods like asking people to self-report what they think they need to flourish in life – psychology has shown that people are often surprisingly incorrect on these matters (particularly when it comes to making predictions and recollections). Some cases in point: having too many varieties of consumer goods actually creates consumer choice anxiety; when it comes to removing bandages, Dan Ariely's research suggests that "getting it over with as quickly as possible" may cause more negative memories than if one went slowly (with breaks) while being careful never to reach a 'peak' in pain; stress is not always harmful (such stress is called eustress). While very careful use of self-report can still be illuminating (e.g. bogus pipeline techniques), in the end, unconscious methods of inquiry seem to be more promising. Some unconscious methods of data collection include the Implicit Association Test and neuroimaging. In these ways, science can further our understanding of what humans need to flourish, and what ways of organizing society provide the greatest hope for flourishing.

Extensive study of cooperation has shed some light on the objective (and subjective) advantages of teamwork and empathy. The brain areas that are consistently involved when humans reason about moral issues have been investigated by a quantitative large-scale meta-analysis of the brain activity changes reported in the moral neuroscience literature.[76] In fact, the neural network underlying moral decisions overlapped with the network pertaining to representing others' intentions (i.e., theory of mind) and the network pertaining to representing others' (vicariously experienced) emotional states (i.e., empathy).

There is evidence to suggest that a risk factor for becoming victims of bullying is deficient moral development. Examples of deficient moral development may be something like neglecting an agent's intentions during an action, or blaming them for accidents. In other words, victims of bullying may be more likely to make less accurate moral assessments, for some reason. The researchers also found that, in contrast, bullies were just as morally developed as victim defenders. The difference is that bullies are more able to disengage themselves. That is, for whatever reason, bullies end up suppressing their feelings of compassion and conscience.[77]

Most think that phenomena such as political instability should be understood by constructing detailed narratives of what actually happened — always looking for patterns and regularities, but never forgetting that each outbreak emerged from a particular time and place. “We're doing what can be done, as opposed to aspiring after what can't,” says Daniel Szechi, who studies early-modern history at the University of Manchester, UK. “We're just too ignorant” to identify meaningful cycles, he adds.

Goldstone has searched for cliodynamic patterns in past revolutions, and predicts that Egypt will face a few more years of struggle between radicals and moderates and 5–10 years of institution-building before it can regain stability. “It is possible but rare for revolutions to resolve rapidly,” he says. “Average time to build a new state is around a dozen years, and many take longer.”

it seems that indicators of corruption increase and political cooperation unravels when a period of instability or violence is imminent.

What is different is the scale — Turchin and his colleagues are systematically collecting historical data that span centuries or even millennia — and the mathematical analysis of how the variables interact.

they call the secular cycle, extends over two to three centuries. It starts with a relatively egalitarian society, in which supply and demand for labour roughly balance out. In time, the population grows, labour supply outstrips demand, elites form and the living standards of the poorest fall. At a certain point, the society becomes top-heavy with elites, who start fighting for power. Political instability ensues and leads to collapse, and the cycle begins again.

when it comes to predicting unique events such as the Industrial Revolution, or the biography of a specific individual such as Benjamin Franklin, he says, the conventional historian's approach of assembling a narrative based on evidence is still best.

“You certainly can't predict when a plane is going to crash, but engineers recover the black box. They study it carefully, they find out why the plane crashed, and that's why so many fewer planes crash today than used to.”

“We can tell you in great detail what the grain prices were in a few towns in southern England in the Middle Ages,” he says. “But we can't tell you how most ordinary people lived their lives.”

Turchin's approach by throwing light on the immediate triggers of political violence. He argues3, for example, that for such violence to happen, individuals must begin to identify strongly with a political group. One powerful way for groups to cement that identification is through rituals, especially frightening, painful or otherwise emotional ones that create a body of vivid, shared memories. “People form the impression that the most profound insights they have into their own personal history are shared by other people,”

Elites have been known to give power back to the majority, he says, but only under duress, to help restore order after a period of turmoil. “I'm not afraid of uprisings,” he says. “That's why we are where we are.”

2) Play to your cognitive strengths while wired. Caffeine may increase the speed with which you work, may decrease attentional lapses, and may even benefit recall – but is less likely to benefit more complex cognitive functions, and may even hurt others. Plan accordingly (and preferably prior to consuming caffeine!)

Recall from memory may be improved by caffeine (here and here), possibly due to enhancements in memory encoding rather than retrieval per se. Another study shows caffeine can actually impair estimates of “memory scanning” speed (in the Sternberg paradigm), so the failure of many studies to find recall-related effects of caffeine may reflect a speed-accuracy tradeoff at the time of retrieval.

3) Play to caffeine’s strengths. Caffeine’s effects can be maximized or minimized depending on what else is in your system at the time. The beneficial effects of caffeine may be most pronounced in conjunction with sugar. For example, one factor analytic study has shown caffeine-glucose cocktails provide benefits to cognition not seen with either alone.

Withdrawal symptoms can onset within 12 to 24 hours of caffeine consumption and last between 2 and 9 days.

some studies show grapefruit juice might keep caffeine levels in the bloodstream high for longer, though others have found no such effect

Similarly, nicotine may speed the metabolism of caffeine.

4) Know when to stop – and when to start again. Although you may not grow strongly tolerant to caffeine, you can become dependent on it and suffer withdrawal symptoms. Balance these concerns with the cognitive and health benefits associated with caffeine consumption – and appropriately timed resumption.

Long-term ingestion of large quantities of caffeine (by way of coffee) is associated with a variety of health benefits – not only cognitive enhancements but also reduction in risk for type 2 diabetes (c.f.), Alzheimer’s and Parkinson’s . These beneficial effects may be related to the neuroprotective role of adenosine.

Caffeine’s effects might be masked by green tea extract, Kava Kava or St. John’s Wort – all of which contain theanine and are associated with subjective feelings of relaxation – but other preliminary evidence indicates the opposite effect: theanine might actually potentiate the benefits of caffeine on some tasks (reported in longer format here).

In addition, there are well-established cognitive effects where recall is best when it matches the context of encoding – so if you’re caffeinated when you study for the test, you better be caffeinated when you take it.

5) Finding good sources of caffeine Despite the huge variety of sources of caffeine – including caffeinated soap, candy, and of course chocolate – the optimal use of caffeine is likely to involve small, hourly doses along with some cardioprotective agent. Given the high solubility of caffeine, absorption time should not be an issue (but if for some reason it is, try gum). Otherwise, why not enjoy a cup of green tea (coffee-flavored, if you must), as the Chinese have for nearly 5000 years? It’s hard to come by a better longitudinal study than that.

Normally, when adenosine levels reach a certain point in your brain and spinal cord, your body will start nudging you toward sleep, or at least taking it easy. There are actually a few different adenosine receptors throughout the body, but the one caffeine seems to interact with most directly is the A1 receptor.

it functions as a supremely talented adenosine impersonator. It heads right for the adenosine receptors in your system and, because of its similarities to adenosine, it's accepted by your body as the real thing and gets into the receptors.

caffeine actually binds to those receptors in efficient fashion, but doesn't activate them—they're plugged up by caffeine's unique shape and chemical makeup. With those receptors blocked, the brain's own stimulants, dopamine and glutamate, can do their work more freely—"Like taking the chaperones out of a high school dance,"

caffeine very clearly doesn't press the "gas" on your brain, and that it only blocks a "primary" brake. There are other compounds and receptors that have an effect on what your energy levels feel like—GABA, for example—but caffeine is a crude way of preventing your brain from bringing things to a halt. "You can," Braun writes, "get wired only to the extent that your natural excitatory neurotransmitters support it." In other words, you can't use caffeine to completely wipe out an entire week's worth of very late nights of studying, but you can use it to make yourself feel less bogged down by sleepy feelings in the morning.

What's important to take away is that caffeine is not as simple in effect as a direct stimulant, such as amphet

amines or cocaine; its effect on your alertness is far more subtle.

The general consensus on caffeine studies shows that it can enhance work output, but mainly in certain types of work. For tired people who are doing work that's relatively straightforward, that doesn't require lots of subtle or abstract thinking, coffee has been shown to help increase output and quality. Caffeine has also been seen to improve memory creation and retention when it comes to "declarative memory," the kind students use to remember lists or answers to exam questions.

The effectiveness of caffeine varies significantly from person to person, due to genetics and other factors in play. The average half-life of caffeine—that is, how long it takes for half of an ingested dose to wear off—is about five to six hours in a human body. Women taking oral birth control require about twice as long to process caffeine. Women between the ovulation and beginning of menstruation see a similar, if less severe, extended half-life. For regular smokers, caffeine takes half as long to process—which, in some ways, explains why smokers often drink more coffee and feel more agitated and anxious, because they're unaware of how their bodies work without cigarettes.

regular caffeine use has also been shown to decrease receptors for norepinephrine, a hormone akin to adrenaline, along with serotonin, a mood enhancer. At the same time, your body can see a 65 percent increase in receptors for GABA, a compound that does many things, including regulate muscle tone and neuron firing. Some studies have also seen changes in different adenosine receptors when caffeine becomes a regular thing.

A 1995 study suggests that humans become tolerant to their daily dose of caffeine—whether a single soda or a serious espresso habit—somewhere between a week and 12 days. And that tolerance is pretty strong.

You start to feel caffeine withdrawal very quickly, anywhere from 12 to 24 hours after your last use. That's a big part of why that first cup or can in the morning is so important—it's staving off the early effects of withdrawal. The reasons for the withdrawal are the same as with any substance dependency: your brain was used to operating one way with caffeine, and now it's suddenly working under completely different circumstances, but all those receptor changes are still in place. Headaches are the nearly universal effect of cutting off caffeine, but depression, fatigue, lethargy, irritability, nausea, and vomiting can be part of your cut-off, too, along with more specific issues, like eye muscle spasms. Generally, though, you'll be over it in around 10 days—again, depending on your own physiology and other factors.

Beyond the equivalent of four cups of coffee in your system at once, caffeine isn't giving you much more boost—in fact, at around the ten-cup level, you're probably less alert than non-drinkers.