Enough with Lewin already!

Happiness: enough already.

The plural of anecdote is not data, as scientists will tell you, but consider these snapshots of the emerging happiness debate anyway: Lately, Jerome Wakefield's students have been coming up to him after they break up with a boyfriend or girlfriend, and not because they want him to recommend a therapist. Wakefield, a professor at New York University, coauthored the 2007 book "The Loss of Sadnes...

Vitamin D: enough already?

Folate fortification: enough already?1,2

The Food and Drug Administration mandated the folate fortification of grain products in the United States by January 1998. The primary driving force behind this policy was the recognition that periconceptional folate supplementation in addition to normal dietary folate intake significantly reduced the incidence of neural tube defects (NTDs), one of the most common birth defects (1, 2). Food for...

“Violence. Enough already”: findings from a global participatory survey among women living with HIV

INTRODUCTION Women living with HIV are vulnerable to gender-based violence (GBV) before and after diagnosis, in multiple settings. This study's aim was to explore how GBV is experienced by women living with HIV, how this affects women's sexual and reproductive health (SRH) and human rights (HR), and the implications for policymakers. METHODS A community-based, participatory, user-led, mixed-m...

On a Problem of Lewin

A digraph G is called primitive if for some positive integer k, there is a walk of length exactly k from each vertex u to each vertex v (possibly u again). If G is primitive, the smallest such k is called the exponent of G, denoted by exp(G). In 1971, M. Lewin introduced the parameter l(G) for a primitive digraph G. It is the smallest k for which there is both a walk of length k and a walk of l...