This is a 9th and 10th grade informational text describing the components and different types of half-life in nuclear physics. While reading, students should cite strong and thorough textual evidence to support analysis of what the text says explicitly as well as inferences drawn from the text. Students should also determine the meaning of words and phrases as they are used in the text, including figurative, connotative, and technical meanings (License: https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License).