Transparency
Sources and corrections
Where our material comes from, what each license permits, and every correction we have published.
Source registry
Each source is recorded with its kind, its trust tier and what its license allows us to store and show. Tier 1 is a primary or official source.
- Computer History Museum — archive, tier 1. Public exhibits and catalog records; images require permission.
- European Space Agency — institution, tier 1. ESA Standard Licence; many images CC BY-SA 3.0 IGO.
- Hagley Museum and Library — archive, tier 1. Holds Sperry UNIVAC and Remington Rand corporate records. Reproduction requires permission.
- ITER Organization — institution, tier 1. Press materials reusable with attribution.
- International Energy Agency — dataset, tier 1. CC BY 4.0 for most free data; verify per dataset.
- International Organization for Standardization — institution, tier 1. Standards are copyrighted; only their existence and scope are cited.
- International Renewable Energy Agency — dataset, tier 1. Statistics reusable with attribution.
- Lawrence Livermore National Laboratory — institution, tier 1. U.S. Department of Energy laboratory; press materials reusable with attribution.
- NASA