For those that ignore it, John Titor[0] was a time traveler sent back in time to acquire some obsolete IBM machine which is needed in the future to debug some legacy code.
You're probably not a native speaker of English, but of Latin. In Latin, `ignorare` can mean `not to know` in addition to its meaning of `not to pay attention to`, but in English, it only has the meaning of `not to pay attention to`.
[0] http://en.wikipedia.org/wiki/John_Titor