Waves can also be separated into transverse and longitudinal waves. In a transverse wave, the motion of the particles of the medium is at right angles (i.e., transverse) to the direction the wave moves.
The experiment's name comes from the Tuskegee Institute, the black university founded by Booker T. Washington. Its affiliated hospital lent the PHS its medical facilities for the study, and other predominantly black institutions as well as local black doctors also participated.
The Tuskegee Study was initiated in 1932 by the Public Health Service. The CDC took over the study in 1957. The CDC's response to the AIDS crisis in the 1980s has been criticized for promoting some public health policies that harmed HIV+ people and for providing ineffective public education.