Of those, only one person has actually been executed, according to the Death Penalty Information Center, a nonpartisan group that studies death penalty laws.
Douglas Davies, of the Centre for Death and Life Studies at Durham University, says even Britons who are not religious want to mark a loved one's passing in a way that reflects that person's values and preferences.
Dr. Kevin Nelson, a neurologist in Lexington, Kentucky, studies near-death experiences and says they're not imagined.
Recent studies of the federal death penalty system reveal that the average cost of defending a capital case are at least eight times those for defense of a non-death penalty case.
Since his death, IndyCar drivers have called for studies on how to improve the safety barriers.
By 1948 the Nuremberg Code, inspired by revelations of experiments in the Nazi death camps, set standards for medical studies on human subjects.
The relationship between impact speed and pedestrian risk of death has been studied previously, but earlier studies based on data from the United States are now several decades old, and more recent studies based on analysis of data from other countries have been limited to cars.
In some cases, these studies even show an elevated risk of death among Medicaid patients compared to the uninsured.
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Various studies have attributed higher risk of maternal death to race, income, region, C-section rates, obesity-related problems and chronic disease.
Human exposure to cyclosarin can cause shortness of breath, muscle spasms, unconsciousness and death, according to the International Institute for Strategic Studies.
But in at least two studies before the 1981 Uniform Determination of Death Act, some "brain-dead" patients were found to be emitting brain waves.
Lilly's own studies show that Zyprexa doubles the risk of stroke death when given to elderly dementia patients.
Studies demonstrate that cachexia is the direct cause of death in a small number of cancer patients (1 to 2 percent).
Numerous studies demonstrate that unemployment increases the risk of sickness and death.
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Psilakis cites studies showing that the people of Crete have the lowest death rate from heart disease and cancer in the world, and he credits the lifestyle and traditional diet that of the poor Cretan farmer.
Dr Wilson told BBC News Online that while studies showed that families who lost one baby to cot death were at increased risk of a recurrence, it still was not entirely clear why this might be happening.
But some studies have looked at different end-points, such as death from all causes, or pneumonia or heart attack.
Studies have shown that students who come from poorer communities like Death Valley have a lot to gain from attending a small school.
Studies suggest social isolation is associated with a higher rate of death in older people and loneliness is the "hidden killer" of the elderly.
But then sales dropped just as quickly after studies combed together the results of previous studies and showed that Natecor seemed to boost the risk of death.
Moreover, he argues in the editorial, the analysis arguing against a risk of cancer death for Vytorin should never have been made public because it could compromise ongoing studies of the drug.
Previous studies have shown that daily aspirin reduces the long-term risk of death due to cancer.
Recent studies by researchers at Massachusetts General make the case that the risks of death from a current medical condition often far outweigh the risk of radiation.
Over time, a number of clinical studies showed that asymptomatic women given regular mammography have a lower breast cancer death rate compared with women who do not get mammography.
At that point, Jones said he decided to donate his own brain to the Sports Legacy Institute -- which studies the link between sports and brain trauma -- for research upon his death.
"This simple experiment demonstrates that nest leaving is not caused by parasite manipulation but by the imminence of death, " says biologist Michel Chapuisat of the University of Lausanne, Switzerland, who studies the evolution of insect societies.
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Academic studies show that the poor suffer worse health outcomes as a result, including premature death.
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In one of Novartis' biggest studies of the drug, it reduced hip fractures by 35% and the risk of death by 28%.
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