American biologists followed up with a study of cat kills in rural Wisconsin.
He gained his PhD with a study of the growth of the towns on the river Medway in 1955.
More questions were raised in March, when the Women's Health Initiative released its second report dealing with a study of estrogen-alone therapy.
They followed this through with a study of 90 newlyweds who were made to sit face to face discussing "volatile" subjects such as housework, sex or in-laws.
He gained his PhD at Columbia University, New York, under the guidance of the Nobel laureate Isidor Isaac Rabi, with a study of the nuclei of sodium atoms.
It combined regular interviews with a study of the impact on each household of benefit changes, pension reforms, social care cuts and fuel price increases.
Edwards ended his presentation with a study of his own, on Ronald Reagan, who is generally regarded as one of the Presidency's great communicators.
He followed this up with a study of the "Inklings", the literary group to which Tolkien had belonged, a book which won the Somerset Maugham Award in 1978.
The idea that a low-calorie diet would extend life originated in the 1930s with a study of laboratory rats.
But it was a French historian, Philippe Ariès, who lured him back to the 18th century, with a study of attitudes towards death in the western world called The Hour of Our Death.
Matthew Yglesias made this point vis-à-vis the banking crisis; he makes it again in connection with a study of a dozen or so healthcare bills that were introduced in the last Congress.
