Discovery Channel is currently advertising "When We Left Earth: The NASA Missions" (http://dsc.discovery.com/tv/nasa/nasa.html).

There are several problems with that page and the pages it links to.

On the main page (above), there are hidden, in appropriate mouseovers in the white space above the graphic. Apparently, the page designer left used another programming page as a template and forgot to remove this code.

Also, click on the "How Space Works" link at the top of the graphic; scroll to below the text. The first two links -- "How Space Shuttles Work" and "Neil Armstrong: First Man on the Moon" -- work.

But the next two links -- "Ten NASA Inventions You Might Use Every Day" and "NASA’s Ten Greatest Achievements" -- yield "Page not found" errors.

Some might find that ironic.