They don't have a threshold for it.
But you have to have a threshold of happiness all around.
You have to have a threshold of intellectual ability – but you need lots of other things, too".
"We have a threshold capability but we don't go beyond that for the simple reasons that our economy is not doing well.
We are pushing the climate system so hard that, if the ice sheets do have a threshold of some kind, we stand a good chance of exceeding it.
Others, such as corn (maize) have a threshold of germination of 50° F (10° C); rice has an even higher threshold, about 68° F (20° C).
"We have a threshold capability but we don't go beyond that for the simple reasons that our economy is not doing well," said Manoj Joshi, a Delhi-based analyst.
Why have a threshold in a ballot but not make our elected politicians or shareholders face the same hurdle?" David Cameron's official spokesman said on Thursday night that public sector strike action is always wrong.
But resist the urge to get a self-closing model, Ms. Driscoll said; they are commonly pressure-mounted and so can become dislodged, and often have a threshold that people can trip on.
"If doctors have a threshold for when they give a dose or start a medication," he said, "you could imagine that the number they are using is too high or too low because a person may be in more pain than they are saying.
"There are a couple of substances that have a threshold amount, but this is not one of them," David Howman, the director general of the World Anti-Doping Agency, said by telephone from India, where he is attending the Commonwealth Games.
