Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20111228011150/http://www.ck12.org:80/flexbook/chapter/1903
customizable, free, curriculum-aligned content for K-12
This chapter is a short non-mathematical course introducing high school physics students and interested non-scientists to the physics of the atomic nucleus and to phenomena associated with nuclear fission.
CK-12 readers should treat this FlexBook as a final draft. This FlexBook underwent a thorough review conducted by practicing teachers, domain experts, copyeditors, technical editors, and has been developed following state and national standards. It can be used in its current form, "flexed" (customized), and/or printed by the user. CK-12 supports feedback on all of its FlexBooks so that they can be continually improved and updated.