Ethan Guo, 19, was hoping to raise $1 million for St. Jude's when his "flight against cancer" was grounded by Chilean authorities.

The White House plans to conduct a wide-ranging review of the Smithsonian Institution's museum exhibitions, materials and operations ahead of America's 250th anniversary.

Ethan Guo, 20, was hoping to raise $1 million for St. Jude's when his "flight against cancer" was grounded by Chilean authorities.