I enjoy very much communication. I think that scientists need to communicate.

Although it is still important to develop an HIV vaccine, we have significant tools already at our disposal that can make a major impact on the trajectory of this epidemic.

Exposures, if they are mild, in the sense of barely just a small concentration, it's mostly an irritant, particularly the peroxides, that in that smoke would irritate the skin or even irritate the lungs. So, for the most time, it could be either just a little bit of a nuisance irritant, or if you get a really big whiff of it, particularly people who have, for example, reversible airways disease, like asthma or different types of hypersensitivity diseases, you could get a serious problem.

You dont have to vaccinate every man, woman and child in the country if you have a couple of cases of smallpox cropping up.

You help someone's health, and you prevent them from infecting others.

Today we know the best way to prevent the spread of Ebola infection is through public health measures.

Activism has been very productive in our society.