Scientists often repeat experiments multiple times. why is this important

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality. potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english

How did southerners view andrew johnson and republicans in congress

How has congress added to the president’s role as chief economic planner over the years?