Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan to provide "a free, world-class education for anyone, anywhere".
The National Science Teaching Association (NSTA), founded in 1944 and headquartered in Arlington, Virginia, is an association of science teachers in the United States and is the largest organization of science teachers worldwide. NSTA's current membership of more than 58,000 includes science teachers, science supervisors, administrators, scientists, business and industry representatives, and others involved in and committed to science education. The organization's mission is to "to promote excellence and innovation in science teaching and learning for all."
The National Council of Teachers of Mathematics is the public voice of mathematics education, supporting teachers to ensure equitable mathematics learning of the highest quality for each and every student through vision, leadership, professional development, and research.