Thanks for the 990 reference. I know how to read these, but it will take some time to figure out how much they plausibly spent on these demonstrations and how the expense was classified. Probably, as a grant to several down the line organizations, who would list demonstration expenses as wages or such.
It does get tedious. You might prefer to scroll through the pages of listed investments to get a sense of where they put their money and where they don't. It does get interesting.
They used to hold Blackrock but a couple of years ago they divested, at least the publicly held Blackrock shares.