This is cool, but (as usual with the Smithsonian) they claim copyright and/or commercial usage restrictions on the downloadable data. I wish they wouldn't do that...
It's a trust administered by the federal government but 1/3 of their funding is not by the government and not all their employees are federal workers.
The ORNL is funded by taxpayer money (80%) but they license technology they develop to companies even exclusively so it's seems the Smithsonian should be able to copyright their work.