16.The one with negative energy is condemned to be a short-lived virtual particle because real particles always have positive energy in normal situations.
17.The Kuiper belt is the source of what are known as short-period comets those that come past pretty regularly of which the most famous is Halley's comet.
18.Around 1960, Forry (who sometimes referred to himself as “the Ackermonster” ) spun off the short-lived but interesting Spacemen, a magazine which covered science fiction films.
20.An exceptionally short-lived marriage had imploded, and I was jobless, a lone parent, and as poor as it is possible to be in modern Britain, without being homeless.