Today,the X-15 hangs in the Air and Space Museum in Washington,D.C.

VOA: special.2010.07.07

The point that I'd been emphasizing is well first point of course has been don't confuse the stages with the entire space-time worm.

我所强调的点是,第一个点当然是,别混淆了阶段,和整条时间虫。

耶鲁公开课 - 死亡课程节选