https://www.khanacademy.org/science/electrical-engineering
https://www.electrical4u.com/
https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-101-introductory-analog-electronics-laboratory-spring-2007/study-materials
https://nanohub.org/groups/biomed - Nano in Biotechnology and Medicine
https://www.efunda.com/home.cfm
https://www.matweb.com/
https://icrank.com/cgi-bin/pageman/pageout.cgi?path=/index_html.html
