"We could look for beacons." "It could be that there are alien civilizations that have simply created something a little bit like a lighthouse that sweeps the plane of the galaxy, goes bleep, and it's there to attract attention, or it's a monument, or an aesthetic symbol or even a religious symbol.

VOA: standard.2010.04.16

So, let me get a little bit more specific about what we mean by nodal plane and where the idea of nodal plane comes from, and nodal planes arise from any place you have angular nodes.

关于节面的意义,或者节面概念的起源，让我们讲的更具体一点，节面起源于角向节点。

麻省理工公开课 - 化学原理课程节选

At the moment the first plane hit, I had just finished doing a bit of color commentary on some eminently forgettable technology news for a Boston business station on AM radio.

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"Hey, that Japan Air may know it but they have fuel spewing out the leftward wing quite a bit, " the pilot of another plane told the control tower, which radioed the JAL crew and halted takeoff.

CNN: Airline: Dreamliner fuel leak due to an open valve

It is a bit like learning the safety instructions on a plane before take-off: you hope you will never need them, but you know it would be unwise to miss the lesson.

ECONOMIST: Idea