Gabe's grandfather told him that when he was growing up, a "milkman" would deliver glass bottles of milk to his family's doorstep. today, milk is not available in glass bottles. gabe explains to him that light destroys the in milk, so milk is now stored in opaque containers to preserve the vitamin.

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