More than 1, 000 subjects have been enrolled in the study for more than a year and over 550 subjects for more than two years.

FORBES: BioSante's Pollyannish Press Release

But fewer students want to study humanities subjects: English departments awarded more bachelor's degrees in 1970-71 than they did 20 years later.

ECONOMIST: The difficulties of an American doctoral student

Ginkgo is a top-selling herb and has been hailed by some as a memory-booster, but the new University of Pittsburgh study found it didn't help prevent Alzheimer's or other forms of dementia in more than 3, 000 elderly study subjects.

CNN: Five ways to keep Alzheimer's away

In teaching mainstream national curriculum subjects, the academy emphasises the need to study more broadly, while enabling the children to get further ahead of their contemporaries.

BBC: Bringing on the brightest

The study subjects also saw their cholesterol levels - another key heart risk indicator - more than halved on average.

BBC: Smoking: The sex divide

In addition, recruitment of study subjects can be easier in developing countries, where a trial subject may get more than a year's pay to participate or participation could be his or her sole means of being able to get treatment, the authors said.

CNN: Growth of clinical trial outsourcing raises issues

Surprise: a 1999 study, where subjects participated this simulated scenario, showed that those who faced a fine were more likely to cheat, not less.

FORBES: Hidden Explanations for Unethical Company Behavior

One study examined the first five years of NCLB and found that while more time was devoted for tested subjects, other subjects such as science and art were cut, on average by 30 minutes a day.

ECONOMIST: Deadlock over standards in schools

Subjects in the study with high-risk gene scores also smoked almost 7, 300 more cigarettes than the average smoker by age 38.

FORBES: Genetic Factors Linked to Smoking Addiction in Teens