In a well known, but questioned (Ahlburg 1983; Macunovich 1995, 1996; McDonald 2000) study, Butz and Ward (1979) argued that fertility becomes counter-cyclical with women's rising employment rates because of the lower opportunity cost of childbearing.
It is well known that the question of global existence or finite time blow-up of smooth solutions for the 3D incompressible Navier-Stokes equations is still unsolved.
It would not have revealed any sensitive national-security information had he simply replied, "Senator Wyden, as you well know, your question is possibly raising issues that should be addressed more appropriately in an executive, rather than an open, session of the committee".
For instance, characteristics of MSCs from patients with different diseases are not well known, and even the question of whether allogeneic or autologous MSC use is preferable is still controversial.
Moreover, the Northern extension of the area where malaria was present in the past is not well known, and thus the question of the relevance of determining the ethnic origin of the mutation carriers to study the relationship between malaria and β-globin could be raised.
Since then, the fundamental rationale has not changed: to collect high-quality data on the physics, chemistry, biology, and geology of the oceans that can be used to answer known questions as well as those we do not yet know enough to pose, to develop new instruments and systems to explore the ocean in new dimensions, and to engage a new generation of youth in science and technology.
The troubles are so well known that some educators questioned the need for another panel to mull over the topic, especially when Mr. Gerstner's commission will study the issue for up to 14 months before issuing a plan of action.
Consequently, scientific studies focusing on the Mudeungsan tuff are not well known worldwide, and many questions, including the emplacement age and morphology of the Mudeungsan Tuff, remain unanswered.
But as their graveyard fills, Hazaras say the mystery lies not in the identity of their attackers, who are well known, but in a simpler question: why the Pakistani state cannot — or will not — protect them.
The artists in question are well known locally; and the table-top size models of their work spaces are packed with scrupulously observed brand-name details taken from photographs or from Mr. Fig's on-site sketches.
