The University of Southern California has been conducting one of the most comprehensive studies on the long-term impact of smog on young people.

CNN: Research finds smog could deal a blow to children's health

While consumers may intuitively believe that advertising to children and obesity are joined at the hip, the most comprehensive studies addressing that question are far from definitive.

FORBES: Is 2013 a Watershed Year for the Anti-Obesity Movement?

One of the most comprehensive studies into media sharing and consumption habits in the United States and Germany reveals that file-sharers buy 30% more music than their non-sharing counterparts.

FORBES: File Sharers Buy More Music Than Non-File Sharers: Not Quite What The Report Says

Phthalates, the chemicals that make a PVC container flexible, "can migrate out of the plastic when it's heated, " says Dr. Halden, who has done comprehensive studies on emerging contaminants and plastics for more than a decade.

WSJ: Is It Safe to Heat Food in Plastic?

It says it has carried out comprehensive environmental studies to make sure any impacts on the river are minimised.

BBC: Drought fears after low winter rain levels

Comprehensive data and studies about transgender children are rare.

CNN: STORY HIGHLIGHTS

Since 2007, there have been more than a dozen comprehensive reviews of BPA studies by independent government scientists around the world, including in Canada, Europe, Japan, Australia and the United States, and each has concluded that current uses of the chemical are safe.

FORBES: Limitations of NHANES survey to analyze BPA

Contrary to the claims of critics, studies show that comprehensive immigration reform, including both low-skilled and high-skilled workers, will result in job creation.

FORBES: Ron Conway: On Why I Care About Technology Policy

Rather than a comprehensive evaluation of all available research, EFSA cherry-picked the studies and proceeded to their conclusion in spite of an acknowledged gap in not only the data they analyzed but their understanding of it.

FORBES: Bee-ing Smart: Regulators Must Distinguish Activists' Bad Dreams From Good Evidence