1 The training course is five weeks. 2  During the first two weeks, students are in the classroom. 3  During the second three weeks, students complete a clinical externship at various Intermountain Healthcare hospitals.
But surprisingly, we still donât know how many species live by the shore: estimates vary widely, from 178,000 species to more than 10 million. NaGISA scientists pulled on their boots and waded and dived in coastal waters around the world to estimate the number of species on our coasts more precisely.
And itâs not only a matter of how many people lived before we appeared, but how many have died. So whatâs the answer? According to estimates by demographic researchers at the Population Reference Bureau (PRB), as of 2015, there have been 108.2 billion who have ever been born. Taking away the roughly 7.4 billion who are alive today, we get 100.8 billion who have died before us. There are almost 14x more people dead than alive!