National Geographic Education develops educational programs for use in classrooms and outside school, with a website to present many of their resources. The redesign of this website, NatGeoEd.org, is based on our research, as described on the site itself:

We designed NatGeoEd.org with you in mind. We started with research conducted by the renowned Education Development Center (EDC), a nonprofit education research institute. We've now been through several phases of research, as well as user testing with educators. As the website evolves, we're continuing to take a user-informed approach to best meet the needs of our expanded audiences, which includes students, families, and informal educators.

See the website here.