Matthew Riehl's six-year descent from a budding attorney to a gunman who live-streamed some of his final violent hours had struggled with episodes of mental illness.
The VA document says Riehl was hospitalized at the veterans medical center in Sheridan, Wyoming, in April 2014 after a psychotic episode.
"You know, I'm not here to hurt anybody but yes I do have firearms,” Matthew Riehl can be heard saying before opening fire on police.
Gitanjali Rao, 11, won a national competition with an invention that measures lead in drinking water. The honor comes with a $25,000 prize.
The STEM School and Academy in Highlands Ranch is experimenting with "STEMified history" taught through the lens of tech and engineering.