Stop hitting your head up against the wall. When it comes to learning any browser language it is easy to become overwhelmed, learning HTML 5 in particular can become a headache. Demystifying the foundation language of HTML is this cheat sheets' main job.
Define descriptive epidemiology. Describe uses strengths, and limitations of selected descriptive study designs such as ecologic study, case report, case series, and cross sectional survey. Define ration, proportion, and rate. Distinguish between crude and be able to calculate age adjusted rates using either the direct or the indirect method. Define standardized morbidity (or mortality) ration.