(...) He says he thinks that it is good that the Obama administration is seeking to get firsthand knowledge of the effects that the war against terrorism is causing the U.S.ally.

VOA: standard.2009.10.30

One question is this: Is it really true that in order to think about the perfectly straight, I must have somehow, somewhere at some point come up against, had direct knowledge of, the perfectly straight?

一个问题是,难道真的说,为了想象一条完美的直线,我必须,在某处直接碰到,并直接了解一条完美的直线吗

耶鲁公开课 - 死亡课程节选

All of this depends on having secure and reliable access to a trusted source of knowledge against which one may compare the facts presented by the claimant.

ECONOMIST: Fake ID cards

Let me reiterate that in 27 years working for the Liberal Democrat Party, not a single personal complaint was ever made against me to my knowledge.

BBC: Lord Rennard

For the rest, those who fancy pitting their knowledge of physics against the pros can do so.

ECONOMIST: The LHC is now operating in earnest