Mental health experts say that making such distinctions may give people a greater sense of control, albeit illusory, over uncertain dangers.
"They are willing to risk the uncertain dangers of the trip north to escape certain dangers they face at home," said Jessica Jones, a member of the commission's fact-finding team.
Breast implants have had a contentious history, with critics saying they are overused and that women in the pursuit of a narrowly defined ideal of beauty end up subject to uncertain dangers from silicone leaks, including auto-immune problems and what animal studies suggest are possible links to cancer.
Three men hiked out of the canyon, preferring the uncertain dangers of the desert to what they felt was certain death if they stayed.
The plot, however, is thin: In a distant country, a meteorite has created a forbidden area of uncertain dangers, the innermost sanctum of which zone is reported to grant any visitors their deepest desires.
While we now face different challenges, make no mistake: the future is uncertain and dangers abound.
The risk of improbable, uncertain, but grave potential dangers poses unique adaptive challenges.
You don't exercise as you meander, uncertain what delight or danger may greet you, while feeling dwarfed by forces older and larger than yourself.
Villar was taken aback and at first was even resistant to leave: the outside world was uncertain, there was the danger of being arrested again and a sense of solidarity in the detention centre.
The ouster of Morsi throws Egypt on an uncertain course, with a danger of further confrontation.
