Indica and sativa are the two main types of cannabis. Cannabis is one of the oldest crops known to mankind, with records of its cultivation dating back thousands of years. Today, it is widely accepted that marijuana has two different species: Cannabis indica and Cannabis sativa.ndica and sativa are the two main types of cannabis. Cannabis is one of the oldest crops known to mankind, with records of its cultivation dating back thousands of years. Today, it is widely accepted that marijuana has two different species: Cannabis indica and Cannabis sativa.
That would make medical errors the third-leading cause of death in America, behind heart disease, which is the first, and cancer, which is second. The new estimates were developed by John T. James, a toxicologist at NASA 's space center in Houston who runs an advocacy organization called Patient Safety America.
In the course of a single life time, medical science has made unprecedented strides in managing advanced illness. As good as the United States health care system is, it is nonetheless prone to serious error. In 2000, the Institute of Medicine estimated that as many as 268 patients die each day due to preventable hospital errors. Although many safety issues are being addressed successfully, a significant safety concern remains.