Mr. Teret, who favors gun control, added that, "Putting a trigger lock on or taking a trigger lock off of a loaded gun can cause the gun to discharge, which creates a new safety issue".
Providing a programmable logic, the TLU takes a trigger decision based on its four input channels.
Take a squirt trigger bottle and put a half inch of good dish washing detergent in the bottom of it, and fill it the rest of the way with water.
That it didn't take a disaster to trigger the reconstruction is a credit to the team of engineers and managers in charge of the water supply, along with elected officials willing to sell the need for the proactive investment to the 8 million users of the system, as well as the community campaigners who pressed for action.
The paper describes a computer model of the uptake of vaccinations by a population, and shows that just a few individuals whose fear of the disease prompts them to take a vaccine can trigger others to do the same.
Based on the data in the study, a total of 498 people would need to take a statin before triggering one extra case of diabetes.
A migraine operation like the one recently described in the journal Plastic and Reconstructive Surgery can take away a trigger or triggers, said Dr. Kriegler, who is an author of the study, but "it doesn't alter the migraine generator".
"It takes a small trigger to spark a deep level hostility," she said.
That it takes a situational trigger like flooding to stimulate concern about climate change is perhaps unsurprising - globally, the issue is simply not at the top of most people's agenda, and it is routinely ranked as less important than the economy, health, or education.
"Partially because of climate change," said Chris Sanders, an exhibition curator and featured artist, "more plants survive longer, and somehow that may be a trigger to take a noninvasive plant and push it so that it escapes and takes over".
