For better orientation, the materials are sorted by level. Some lower-level materials (e.g. Advent calendar, ecard) may also be fun for students at higher levels.

The University of Wisconsin-Madison Materials Research Science and Engineering Center (UW MRSEC) Interdisciplinary Education Group uses examples of nanotechnology and advanced materials to explore fundamental science and engineering concepts (2013).

The Economics Network of the UK's Higher Education Academy provides resources to support university teachers of economics (2009-18).

This presentation explores the past and present of American parties, issues, and the right to vote (USA: LOC 2023).

Educational Materials by D. G. Mackean (U.K. 2008)

Educational materials related to global education, interconnectedness, and children’s humanitarian issues (UNICEF 2016)

Classroom tested, Internet-based economic lesson materials for K-12 teachers (USA 2009)

Educational materials from National Geographic (2012)

The non-profit organization offers a repository of high-quality educational learning materials to learners and educators (USA 2018).

Educational materials from National Geographic (2012-19)