Critical Thinking Websites
procon.org
Pros and cons of controversial issues. Read pro and con arguments for and against topics such as medical marijuana, euthanasia, prostitution, gun control, and more
25,144 
$ 534,240.00
hackmath.net
Math portal. 4244 solved examples and tests in mathematics. Warn-ups from counting. Mathematical calculators for school and practice.
47,485 $ 282,960.00