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It's been nearly *five* years since we first uploaded our first math lectures on YouTube. Six thousand lectures later, we've expanded into physics, astronomy, and chemistry! During this period we have contributed thousands of dollars to upgrade our video cameras and editing computers to produce HD video and improve sound quality.

If you've found iLectureOnline helpful and wish to contribute to our goal of making the math and sciences easier for everyone around the world to understand, please consider donating. Any amount will be helpful and greatly appreciated!