Blastocyst culture: facts and fictions

Blastocyst culture: facts and fiction.

The use of sequential media has made extended culture and transfer of blastocysts feasible for human IVF. Embryo transfer on day 5 has been claimed to result in higher implantation rates than transfer on day 3, on the basis of retrospective comparative studies. This is not supported convincingly, however, in randomized controlled trials published to date. Blastocyst culture imposes additional r...

Cloning Facts and Fictions

Facts and fictions

"We must always think about things, and we must think about things as they are, not as they are said to be"-George Bernard Shaw "Every man has a right to his opinion, but no man has a right to be wrong in his facts."-Bernard M. Baruch "The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd, indeed, in view of the silliness of the majority of mankind,...

Systematic Errors: Facts and Fictions

The treatment of systematic errors is often mishandled. This is due to lack of understanding and education, based on a fundamental ambiguity as to what is meant by the term. This note addresses the problems and offers guidance to good practice. 1 RIVAL DEFINITIONS: UNCERTAINTY AND MISTAKE 1.1 Random Uncertainties and Mistakes The word error is used in several ways. The everyday dictionary defin...

The Rorschach: facts, fictions, and future.

A large body of empirical evidence supports the reliability, validity, and utility of the Rorschach. This same evidence reveals that the recent criticisms of the Rorschach are largely without merit. This article systematically addresses several significant Rorschach components: interrater and temporal consistency reliability, normative data and diversity, methodological issues, specific applica...