It is the one constant in every university endeavor; it impinges on hiring, distorts the curriculum, and sucks up vast amounts of faculty time and taxpayer money.
Raw sensory signals, the electromagnetic waves that impinge upon our retinas, the pressure waves that assault our eardrums, and so on, well, they're always ambiguous and uncertain.
They can turn down applications from scientists they believe will work against their interests, or research projects that will impinge too much on their daily lives and traditional activities.
The young man so shaped his trackless course as to impinge on the path a little ahead of this coloured form, and when he drew near her he smiled and reddened.