Sean Hannity

Ironically, it is only when disaster strikes that the shuttle makes the headlines. Its routine flights attracted less media interest than unmanned probes to the planets or the images from the Hubble Telescope. The fate of Columbia (like that of Challenger in 1986) reminded us that space is still a hazardous environment.

I'd say Harvard graduates leave here with a sense of the possible and the limit - and a sense that there are no limits to what humans can do and that you can always be pushing, whatever limit you think might be there.