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Catalan reference search across substantial published works

Charles Darwin's publications, notebooks and papers

Self-paced courses with subject and specialization routes.

Thermal-comfort models with visible environmental inputs

Symbolic tensor calculations for field-theory problems

Check website responses alongside issue history and user reports

Sourdough recipes with starter care and bread-science guides

Stream lecture-based courses across nonfiction subjects.

Lectures and courses for broad nonfiction learning.

Observe garden wildlife with a naturalist community

Full Moon cult and horror features with direct subscriptions

NASA's child-focused articles, activities and games about Earth, space and technology.

European Space Agency space stories, activities, games and multimedia for children.

Subject calculators and a custom calculator builder

Ask a research question and get an answer grounded in open science papers, with citations.

Sourdough guides, planning references and a free bread book

STEM graduate jobs, placements and employer information

Educational collections of historical source texts

Oregon history and culture with primary-source companions

The U.S. Energy Information Administration's children's resource on energy sources, use and conservation.

Indian online courses across academic and professional subjects.

Coding exercises for data and machine-learning study

Computational queries across mathematics and factual topics

An introduction to computer programming from Waterloo