National Science Foundation – Who better to educate you on science than the National Science Foundation? Through their site, students can find videos, publications, stats, and more.
Wolfram MathWorld – Need help with a type of math? Don’t understand math terminology? Head to this site for all the guidance and materials you’ll need to master any mathematical problem.
Google Scholar – Search on this site to find scholarly articles on any topic you can think of. Some are free to read online, but others may require logging into your school or library account.
HippoCampus – Explore over 7000 free videos in 13 subject areas