The investigators, led by Dr Katherine Chretien of the Washington DC VA Medical Center, said medical students may not be aware of how online posting can reflect negatively on medical professionalism or jeopardise their careers.

BBC: 'Tweeting' medics expose patients

In the evening, the Vice President and Dr. Biden will depart London, United Kingdom, en route Washington, DC.

WHITEHOUSE: President's Schedule

But Dr Franco Lori from the Research Institute for Genetic and Human Therapy in Washington DC has been investigating whether interruptions in treatment might actually boost the immune system.

BBC: Treatment 'holidays' may stall HIV

"Landing on Mars is very difficult, and it's harder on some parts of the planet than others, " says Dr Ed Weiler, associate administrator for space science at Nasa in Washington, DC.

BBC: Gusev crater (Nasa)

Dr Rachel Moon, of the Children's Medical Center, in Washington DC, and one of the authors, suggested that children who sleep on the backs at home may be at increased risk of sudden infant death if they are placed on their front during the day.

BBC: Childminders 'raise cot death risks'

Dr. BROCK: And so in a study of over 500 women from the Washington, DC, area, as a matter of fact, more than 50 percent of them were very happy with their, you know, overweightness because their husbands or counterpart felt that--the person in their lives felt that that's the way they liked them, so they were very satisfied with having hips and thighs, and this is a norm for us.

NPR: Roundtable: Black Women and Body Image