This free biology textbook from Boundless Learning is based off openly available educational resources such as "government resources, open educational repositories, and other openly licensed websites." The textbook...

This publication describes the combinations of standard and special microbiological practices, safety equipment, and facilities constituting Biosafety Levels 1-4, which are recommended for work with a variety of...

All About Circuits is a website that “provides a series of online textbooks covering electricity and electronics.” Written by Tony R. Kuphaldt, the textbooks available here are wonderful resources for students, teachers,...

Written by Tony R. Kuphaldt, this chapter of All About Circuit's fourth volume on Digital circuits examines Boolean algebra and logic. The chapter has a helpful introduction that discusses the difference between real...

This report is an enjoyably accessible introduction to broadband communications for an era in which the term itself is increasingly pitched as the mark of excellence in high-speed Internet access. Published by the...