observational

A technique called Mendelian randomization is overturning the conclusions of observational studies in public health. But researchers question whether the method can overcome its fundamental limitations.

While sugary beverages seem to be the worst offenders, artificially sweetened drinks might also be associated with health problems, an observational study suggests.

Inflammation may be a strong contender for the connection between mom’s weight and children’s neurodevelopment, according to lab studies on animals.

An online survey finds that people report feeling most relaxed with a glass of red wine or beer, and most aggressive when drinking spirits.

Researchers find differences in predatory behavior between a long-observed chimp tribe and a recently habituated one. 

Potential biases in scientific data collection and analysis should be minimized.